Report on the zoological collections made in the Indo-Pacific Ocean ...

300 COLLECTIONS FEOM MELANESIA.is somewhat elongated, trigonous, and has a small spinule at itsdistal end ; the rami arc subequal and longer than the base, yet notgreatly elongated as in some species. The colour (in spirit) is yellowish,usually closely and somewhat irregularly punctulated withblack. Length of the largest example about 8 lines (17 millim.) ;breadth nearly 3^ lines (7 millim.).These specimens very nearly resemble examples referred to L.gaudichaudiifrom Madjica-Sima in the Museum collection ; but thebody is less distinctly granulated, and the granulations do not generallyextend over the median dorsal line of the postabdominal segments,and the notches of the terminal segment are not distinctlytoothed. In one specimen, however, I have observed a continuousline of granules bordering the posterior margins of the postabdominalsegments.In the uncertainty that exists regarding the true nomenclature ofnot a few species of this genus, I prefer to retain the name of australiensisas a designation for this variety. Mr. Thomson* has describeda species from Dunedin, New Zealand (L. quadrata), which isevidently nearly allied to the L. australiensis, but may, perhaps, bedistinguished by the less prominent postero-lateral angles of the lastostabdominal segment, which J is described as " subquadrate, withthe angles hardly projecting."2. Ceratothoa imbricata.Oniscus imbricatus, Fahr. Mantissa Insect, i. p. 241 (1787).Cymothoa imbricata, Fabr. Ent. Syst. ii. p. 503 (1793) ; Suppl. p. 304(1798).Cymothoa banksii, Leach, Diet. Sci. Nat. xii. p. 353 (1818) ;Desmarest,Cunsid. Crust, p. 309 (1825) ; M.-Fdwards, Hist. Nat.Crust, iii. p. 273 (1840) ;Heller, Feise der Nuvara, Crust, p. 148(1865).Cymothoa trigonocephala, M.-Edwards (nee Leach ?), Ann. Sci. Nat.ser. 2, iii. pi. xiv. tigs. 1, 2 (1835) ; Crust, in Cuv. Fegne Animal,pi Ixv. fig. 2 ; Hist. Nat. Crust, iii. p. 272 (1840), var.; Ouerin,Icon. Crust. Fegne Animal, pi. xxix. fig. 2 {after Milne-Edwards ).Ceratothoa trigonocephala, Heller, Nuvara Crust, p. 148 (1865) ;Thomso7i, Trans. Neio-Zeal. Inst. xi. p. 233 (1879), var. ; Hastvell,Cat. Austr. Crust, p. 282 (1882), after M.-Edwards.? Cymothoa approximans, White, t. c. p. 110 (1847).Ceratothoa bauksii, Miers, Cat. Neio-Zeal. Crust, p. 135 (1876).A small specimen, presenting no distinctive external sexual characters,is in the collection from Port Jackson, 0-5 fms. It is undoubtedlyidentical with a somewhat larger specimen from the samelocality in the British-Museum collection, taken " from the mouth of abream." The type example of C. hanlcsii (thus designated in the handwritingof Dr. Leach) is of larger size, and is said to have been obtainedin the New-Zealand seas ; it presents no distinctions which can beregarded as of specific importance, and the description which I have* Trans. New-Zeal. Inst. xi. p. 232 (1879).