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192 Side-plates of 1st segment of raesosome abruptly truncated at the posterior corner. Last segment of metasome much broader than it is long, and obtusely truncated at the tip. Antennse very short, with the last joint of the flagellum nearly 3 times as long as the 1st. Legs, pleopoda and uropoda nearly as in A. pictum. Colour of dorsal face dark brown, more or less distinctly variegated with lighter patches, arranged as in the above-named species. Length of body scarcely exceeding 5 mm. Remarks. In its general appearance this species bears considerable resem- blance to A. pictum, and may easily be confounded with it. On a closer examination, it is however found to differ very markedly in certain points, and may thus undoubtedly be regarded as specifically distinct. The peculiar form of the side-plates of the 1st segment of the mesosome is an especially racter, and the caudal segment also differs essentially in its form. marked cha- Occurrence. I have myself only met with this species in a single locality near Christiania, viz., close to the shore on the outermost point of the Ladegaardso, where it was found occasionally below stones together with Porcettio pictus. Mr. Ellingsen has, however, collected it in 3 different places, viz., at Kragero, Grim- stad and Boro, and some few specimens in our Univ. Museum were also found among A. pictum, and were collected at Langesund by it exactly resembles A. pictum. the late Dr. Jensen. In habits Dstribution. Northern and Central Europe, in the same places as A. pictum.
Tribe 6. EPICARIDA. The Isopoda belonging to this tribe are all parasitic forms, and their hosts are invariably other Crustacea of different orders ; hence the above name of the tribe. They are the most degradated forms of Isopoda, and in some instances the fully-grown female represents merely a simple sac rilled with ova, and without any trace of segmentation or of limbs, so that the idea of its being a crustacean animal would hardly suggest itself, if the development were not known. In all the forms a more or less pronounced regressive metamorphosis has been observed, comprising at least two distinct larval stages, very dis- similar both in their general appearance and in the structure of the several appendages, and equally different from the adult animal. As will be shown further below, there is in all probability in most of the forms even a 3rd intermediate larval stage, the Microniscus stage, which, however, has not hitherto been recognized as such, but has been wrongly regarded as an adult form of Epicarida representing even a distinct family. The sexual dimorphism in all the forms is very pronounced. The male in all cases, as compared with the adult female, is of diminutive size, and is generally found clinging to the genital region of the female like a parasite. It is also of an appearance very different from that of the female, retaining, as it does, several of the larval characters, and in some instances it does not differ from the last larval stage except by the presence of generative organs. In certain cases (Entoniscidre), the parasite penetrates to the inner organs of its host, looking merely like an endoparasite, and in all such cases the body of the female is found to be greatly deformed. But when the parasite retains its character as a true ectoparasite, the female also exhibits, as a rule, some more or less pronounced deformity - - and is often conspicuously asymmetrical; even when the segmentation of the body is
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AN ACCOUNT OF THE CRUSTACEA OF NORW
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BERGEN. JOHN GRIEG
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VI Copenhagen Museum, who have kind
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VIII H. J. Hansen. Oversigt af de p
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X C. Bovattius. Notes on the family
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thus meriting the name of true gnat
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Tribe 1. CHELIFERA. Body generally
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of legs. In the structure of the or
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8 fied with Apseudes talpa of Monta
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10 in female rather strong, hand ve
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12 flagellum. Inferior antennae a l
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14 Tanais, on separate lobes. Super
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16 Gen. 2. Paratanais, Dana, 1852.
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18 the genus Parataitais. Inferior
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20 robust than in T. tenuimanus, wi
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22 Remark*. - This form was first r
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24 free segment of mesosonie longer
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26 Occurrence. Only 2 female specim
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28 Distribution. -- Off Reykjavik,
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30 projection not denned from the b
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32 Imt slightly setous. Chelipeds s
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34 Cryptocope abbreviata, (PL XV, f
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Occurrence. I have met with this fo
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38 wholly absent, in male normally
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Apseudidee. G.O. S ars, autogr . I
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Ta na i d ae. 6.0. S ars, autogr. "
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Jar. aid se. G.O. S ars, autogr. I
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Ta n a i d ae. G. 0. S ars, autogr
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Ta naid as. G.O. S ars, autogr. I s
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Is Ta n a i d as . G.O. S ars, auto
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Ta n a i d as. G.O. S srs, autogr.
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40 1. Pseudotanais forcipatus (Lill
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42 form; carpal spine of the succee
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44 without distinct coxal plates. M
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46 first 2 segments of mesosome som
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long sensory 48 filaments. Mandible
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50 Fam. 2. Gnathiidae. r*. Body of
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52 Praniza might be the female of A
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54 2. Gnathia dentata, (PI. XXII. f
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56 Distribution. Greenland (Kroyer)
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58 Gen. 1. ^Ega, Leach, 1815. Gener
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60 2. &g& tridens, Leach. (Pi. XXV,
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62 the end of the propodos, inside
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64 7. ^Ega ventrosa, (PL XXVI, fig.
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66 spinules. Eyes very large, nearl
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68 Remarks. The above diagnosis ref
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70 hroad, coarsely spinous at the t
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72 Anterior pairs of legs nearly as
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74 mentary stars, arranged in trans
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76 Limnoria lignorum (Eathke). (PI.
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Tribe 3. VALVIFERA. Remarks. The ch
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80 E. Miers 1 ), the genus comprise
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Ta na i d SB. G.O. S ars, autogr. I
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Anthuridae. G.O. S ars, autogr . I
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Gnathiidae. G. 0. S BTS, autogr . I
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tgidae. G.O.Sars. autogr. I s opo d
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fegidae. G. 0. S ars, autogr . Is o
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G.O. S ars, autogr . I s opo da. PI
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Cirolanid I s opo da. PI. .,-.,..-
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Idotheidas. G.O. S ars, autogr . I
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82 flagellum much shorter than the
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84 he records as I. phosphor ca Har
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86 Occurrence. The species has a di
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88 Arc-torn* given by Latreille to
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90 2. Astaeilla arietina, G. 0. Sar
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92 Occurrence. It would seem to be
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Tribe k. ASELLOTA. Be-mark*. In the
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96 suture along the middle, and 2 l
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98 Fam. 2. laniridae. Characters. G
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U)0 peduncle. Kpignath of the maxil
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102 of 400 fathoms. Subsequently I
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104 length, without any distinctly
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106 Remarks. The type of this famil
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108 2. Munna limieola, G. 0. Sars.
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110 Inferior antenna?, as compared
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112 Paramunna bilobata, (PI. XLVII,
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114 hairs in their outer part, tip
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116 Gen. 4. DendrOtlOn, G. O. Sara,
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IdoiheidaB. G.O. S ars, autogr . I
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Arciuridaa. G.O. S srs, autogr I s
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Arcturidae. G.O. S ars, autogr I s
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Janiridse. G.O. S srs, autogr . I s
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laniridas. I s op o da.. PI. 42 G.
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Munnids. Is op o da.. PI. 44. G.O.S
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Munnidas- G.O. S ars, autogr I s op
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Munnidae. I s opo da- i. G. 0. S ar
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118 Fam. 4. Desmosomidae. Character
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120 ever, rather different, and ver
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122 middle, to a strong, recurved,
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124 short. Uropocla scarcely exceed
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126 form, with the proximal joints
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128 to he identical with a form pre
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130 the mandibles, in particular, i
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132 As our knowledge of this peculi
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134 with the carpal joint oblong fu
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136 1. Ilyarachna longicornis, (PI.
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m 138 3. Ilyarachna denticulata, G.
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140 antennae not quite twice as lon
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142 Occurrence. I first discovered
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144 Gen. 6. EliryCOpe, G. 0. Sars,
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Desmosomidae, I s op o da.. PI. 50.
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Desmosomidae 1 . G. 0. S ars, autog
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Munnopsidae. G.O. S ars, autogr , I
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Munnopsidas. 6. 0. S ars, autogr .
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IVlunnopsidae. G.O. S ars, autogr .
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Munnopsidae. G 0. S srs, autogr . I
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146 taken it very plentifully on a
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148 must also occur off the coasts
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150 the carpal one. dactylus minute
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152 orbicular in form, dactylus com
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154 The mandibles are strong, and a
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or less elongated, basal part not p
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158 Remarks. This genus, establishe
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160 thin, without air-chambers or a
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162 Occurrence. According to Mr. Bu
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of n little bowl of a spoon; that o
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166 clear golden yellow colour, wit
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168 the last peduncular joint, and
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170 broad and laminar, though scarc
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172 ramus narrow lanceolate, and ex
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174 Remarks. This form was first de
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176 Gen. 4. PorcelllO, Latr., 1804.
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178 wards, frontal lobe less promin
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180 4. Poreellio Rathkei, Brandt. (
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182 plates of only the 2 anterior p
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184 increasing in length posteriorl
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Munnopsidae. I s op i. G.O. S ars,
Page 323: Munnopsidae. G.O. S ars, autogr . I
Page 327: G.O. S ars, autogr . s op o Lig'ia
Page 331: Trichoniscidae. I s op o da. PI. 72
Page 335: Trichoniscidae. 1 S O ]3 O CLQ._ PI
Page 339: Oniscidas. I s opo da. PI. 76. G.O.
Page 343: Oniscidae. I s op o da. PI. 78. : r
Page 347: Oniscidae. I s op o da. P! . 80. G.
Page 351: Armadillidiidas. I s op i. V., V^,.
Page 355: JBopyridae. I s opo da- t G.O S ars
Page 359: Bopyridae. G.O S ars, autogr. I s o
Page 363: Bopyridae. G. 0. S ars, autogr I s
Page 366 and 367: 186 Remarks. The present genus, est
Page 368 and 369: 188 above-described genus Cylisticu
Page 370 and 371: 190 as it is very common both in Sw
Page 374 and 375: apparent. In the latter case, the 3
Page 376 and 377: 196 simple, conic; posterior antenn
Page 378 and 379: 198 Occurrence. This form is found
Page 380 and 381: 200 fully grown, the parasite cause
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Page 384 and 385: 204 tal lamella, the distal edge of
Page 386 and 387: 206 able want of correctness, as re
Page 388 and 389: 208 branchiata. In the female, more
Page 390 and 391: 210 Remarks. The present genus is v
Page 392 and 393: 212 soft metasome of this Crustacea
Page 394 and 395: 214 Miiller ought to be referred to
Page 396 and 397: 216 and to a 'great extent encompas
Page 398 and 399: 218 The genus MiCrOmSCUS, Fritz Mii
Page 400 and 401: 220 tary appearance, in the present
Page 402 and 403: 222 as a rule, very small and somet
Page 404 and 405: 224 as Boj>-t/r/is mys'ulum and by
Page 406 and 407: 226 On a closer examination, will t
Page 408 and 409: 228 area in front. Caudal part of b
Page 410 and 411: 230 2 middle figures on PI. 96) are
Page 412: 232 shorter than the inner. Male no
Page 415: Bopyridae. I s op i. G. 0. S ars, a
Page 419: Bo py rid as. I s op o PI. G.O. S .
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Dajidae. G. 0. S ars, autogr . I s
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Dajid as. Is op o PI. 96. G. 0. S a
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234 anal segment obtusely produced
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236 Gen. 2. CryptOthlr, Dana, 1852.
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238 Aseoniscus simplex, G. 0. Sars,
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240 anal segment rounded at the tip
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242 apparatus present, Male (or las
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244 at present to state, as they ar
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246 Cryptoniseid (PI. C, fig. 3). N
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248 much more advanced stage, the o
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250 Page 122. Add the following spe
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252 Page 129. Add the 3 following s
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254 the end of the caudal segment.
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Acanthocope Acherusia Page. 131 65
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Page. crassicornis 175 Isevis 161 M
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Page. tenuicornis 23 tenuimanus 18
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PL 16. G. o. Bars. 1. Strong-ylura
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PL 84. 1. Bopyrus sqvillarum (Latr.
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2b. p 7 . Same, leg of 7th pair, ex
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cf p 3 - Same, leg of 3rd pair, cfp
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Cryptoniscidce. G.O.Sars, autogr. 1
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Cryptoniscidae. 1 S C>p O Pi. 100 G
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Desmosomidae. I S Op O da. Suppl. G
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Desmosomidae. 1 S O p O CLQ- Suppl.
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An Account of The Crustacea of Norw
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