OCR Text |
Show 138 ON CRUSTACEANS F R O M DUKE-OF-YORK ISLAND. [Feb. 20, Cancer hydromus, Herbst, I. c. p. 16, pl. xii. fig. 2, $ (1796). Cardisoma carnifex, Latr. Encycl. Meth. Hist. Nat. x. p. 685 (1825) ; M.-Edw. Hist. Nat. Crust, ii. p. 23 (1837); A. M.-Edw. Nouv. Arch. Mus. Hist. Nat. ix. p. 264 (1873). In the single imperfect specimen (male) of this species in the collection a very small tooth exists at some distance behind the external orbital angle; the raised line defining the antero-lateral margins is continued but a short distance backward beyond this tooth; the left anterior leg is the larger ; the ambulatory legs are clothed with long hair3. PAGURUS PUNCTULATUS. Pagurus punctulatus, Olivier, Encycl. Meth. viii. p. 641 (1811) ; M.-Edw. Hist. Nat. Crust, ii. p. 222 (1837). A single specimen of this very common species is in the collection, a female, inhabiting the shell of Dolium perdix. White, in the 'List of Crustacea in the Collection of the British Museum,' p. 60, adopts Herbst's earlier name of Cancer megistos for this species; but, as the description and figure of O. megistos are wanting in the only copy of Herbst's work that I have seen, I retain for the present Milne-Edwards's designation of Pagurus punctulatus, by which this species is generally known. PARRIBACUS ANTARCTICUS. Scyllarus antarcticus, Lund, Skrivt. Naturh. Selsk. Kjoben. Bd. ii. Heft 2, p. 22 (1793); Fabr. Ent. Syst. Suppl. p. 399 (1798). Ibacus antarticus, M.-Edw. Hist. Nat. Crust, ii. p. 287 (1837). Parribacus antarcticus, Dana, U.S. Expl. Exp. xiii. Crust, i. p. 517, pl. xxxii. fig. 6 (1852). Two specimens, a male and a female, were collected. The male has the appendages (pleopoda) of the second and third abdominal segments much larger than those of the female, foliaceous, and equally developed; in those of the fourth and fifth segments the inner ramus is rudimentary. In the female the third, fourth, and fifth segments have the inner ramus of the appendages produced, substyliform, and two-jointed at its extremity. LYSIOSQUILLA MACULATA. Squilla maculata, Fabr. Ent. Syst. ii. p. 511 (1793); Lamarck, Hist. Ann. sans Vert. v. p. 188 (1818) ; M.-Edw. Hist. Nat. Crust! ii. p. 518 (1837). Cancer (Mantis) arenarius, Herbst. Naturg. Krabben u. Krebse ii. p. 96, pl. xxxiii. fig. 2 (1796). One specimen, a male, of this common Indo-Pacific species is in the collection. It is of rather small size (about 8 inches). This species, when fully grown, is probably the largest of the genus. |