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88 Arc-torn* given by Latreille to another genus which has generally been regarded as the type of the family. The name of the family should therefore perhaps more properly be changed to Astaclllidce. The present genus is chiefly distinguished from Arcturus by the greath. length of the middle segment of the mesosome, which gives the body an extremely slender, nearly cylindrical form, whereas in Arctnrus it is more fusiform in shape. Moreover the structure of the 1st pair of legs is slightly different, and the incubatory pouch, is formed by 3 pairs of distinct lamella? issuing from the 2nd, segments, is here only confined to the middle segment genus comprises several species, amounting Norway belong 4 species, to be described below. 1. Astacilla longicornis (Sowb.) (PI. XXXVI.) Omscus lonijiciHiils, SdAverliy, Brit. Miscell. T. 19. : Syn Lcacia lacertnsa. Jolmst. ,. Arcturus longicorms, Westw. ., gracilis, G
89 Inferior antenna? attaining the length of the body, not including the terminal segment of metasome, flagellum scarcely joint, and having the 1st articulation twice as long more than 1 /s as long as the last peduncular as the other 2 combined. Male much smaller than female, and extremely slender, with the middle segment of mesosome narrow cylindric in form, and quite smooth. Superior antenna? with the flagellum much larger than in female, and provided with a greater number of olfactory filaments. Colour yellowish, clouded with irregular dark brown shadows. Length of adult female reaching 20 mm., that of male scarcely that size. more than half Remarks. The present species was first described by Sowerby in the above quoted paper under the name of Oniscus longicornis. It is, however, very probable that the form observed by the Eev. Charles Cordiner several years previously, and named Astacilla, without any specific denomination, was the very same species. The form recorded by Johnston as Lcacia lacertosa, is undoubtedly this species. By most of the earlier authors, it has been referred to the genus Latreille. The Arc-turns yracilis of Goodsir is, in my opinion, nothing Arcturus of else than the adult male of the present species. From the other Norwegian species, it may be chiefly distinguished by its slender and elongated body, and by the rather slight development of the dorsal tubercles. Occurrence. This species would seem to occur along the whole coast of Norway, from the Christiania Fjord to Vadso. It is generally found in moderate depths, ranging from 10 to 30 fathoms, clinging to Hydroida and Polyzoa, several specimens, females, males and young, being often associated in the same colony. By the aid of its 3 posterior pairs of legs, the animal is capable of getting a rather firm hold on the object to which it is clinging, moving the fore part of its body freely to and fro in search of food, which is first seized by the long pediform inferior antenna?. At times it is seen to leave go its hold, and to start off rather rapidly through the water, in order to affix itself on some other place. This motion is effected by the aid of the 2 anterior pairs of pleopoda, which in such cases are protruded from the shelter of the valvular uropoda, and push the animal forwards. Not infrequently female specimens are found carrying their young brood affixed all round the long inferior antenna1 , which thereby acquire a peculiar velvety appearance. Distribution. British Isles (Sp. Bate). Kattegat (Meinert), Iceland. 12 Crustacea.
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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
Page 110 and 111: 70 hroad, coarsely spinous at the t
Page 112 and 113: 72 Anterior pairs of legs nearly as
Page 114 and 115: 74 mentary stars, arranged in trans
Page 116 and 117: 76 Limnoria lignorum (Eathke). (PI.
Page 118 and 119: Tribe 3. VALVIFERA. Remarks. The ch
Page 120: 80 E. Miers 1 ), the genus comprise
Page 123: Ta na i d SB. G.O. S ars, autogr. I
Page 127: Anthuridae. G.O. S ars, autogr . I
Page 131: Gnathiidae. G. 0. S BTS, autogr . I
Page 135: tgidae. G.O.Sars. autogr. I s opo d
Page 139: fegidae. G. 0. S ars, autogr . Is o
Page 143: G.O. S ars, autogr . I s opo da. PI
Page 147: Cirolanid I s opo da. PI. .,-.,..-
Page 151: Idotheidas. G.O. S ars, autogr . I
Page 154 and 155: 82 flagellum much shorter than the
Page 156 and 157: 84 he records as I. phosphor ca Har
Page 158 and 159: 86 Occurrence. The species has a di
Page 162 and 163: 90 2. Astaeilla arietina, G. 0. Sar
Page 164 and 165: 92 Occurrence. It would seem to be
Page 166 and 167: Tribe k. ASELLOTA. Be-mark*. In the
Page 168 and 169: 96 suture along the middle, and 2 l
Page 170 and 171: 98 Fam. 2. laniridae. Characters. G
Page 172 and 173: U)0 peduncle. Kpignath of the maxil
Page 174 and 175: 102 of 400 fathoms. Subsequently I
Page 176 and 177: 104 length, without any distinctly
Page 178 and 179: 106 Remarks. The type of this famil
Page 180 and 181: 108 2. Munna limieola, G. 0. Sars.
Page 182 and 183: 110 Inferior antenna?, as compared
Page 184 and 185: 112 Paramunna bilobata, (PI. XLVII,
Page 186 and 187: 114 hairs in their outer part, tip
Page 188: 116 Gen. 4. DendrOtlOn, G. O. Sara,
Page 191: IdoiheidaB. G.O. S ars, autogr . I
Page 195: Arciuridaa. G.O. S srs, autogr I s
Page 199: Arcturidae. G.O. S ars, autogr I s
Page 203: Janiridse. G.O. S srs, autogr . I s
Page 207: 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,
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Munnopsidae. G.O. S ars, autogr . I
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G.O. S ars, autogr . s op o Lig'ia
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Trichoniscidae. I s op o da. PI. 72
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Trichoniscidae. 1 S O ]3 O CLQ._ PI
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Oniscidas. I s opo da. PI. 76. G.O.
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Oniscidae. I s op o da. PI. 78. : r
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Oniscidae. I s op o da. P! . 80. G.
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Armadillidiidas. I s op i. V., V^,.
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JBopyridae. I s opo da- t G.O S ars
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Bopyridae. G.O S ars, autogr. I s o
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Bopyridae. G. 0. S ars, autogr I s
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186 Remarks. The present genus, est
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188 above-described genus Cylisticu
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190 as it is very common both in Sw
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192 Side-plates of 1st segment of r
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apparent. In the latter case, the 3
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196 simple, conic; posterior antenn
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198 Occurrence. This form is found
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200 fully grown, the parasite cause
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nier to their genus 7 \/ la '//////
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204 tal lamella, the distal edge of
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206 able want of correctness, as re
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208 branchiata. In the female, more
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210 Remarks. The present genus is v
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212 soft metasome of this Crustacea
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214 Miiller ought to be referred to
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216 and to a 'great extent encompas
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218 The genus MiCrOmSCUS, Fritz Mii
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220 tary appearance, in the present
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222 as a rule, very small and somet
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224 as Boj>-t/r/is mys'ulum and by
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226 On a closer examination, will t
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228 area in front. Caudal part of b
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230 2 middle figures on PI. 96) are
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232 shorter than the inner. Male no
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Bopyridae. I s op i. G. 0. S ars, a
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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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