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Show 1877.] ON CRUSTACEANS FROM DUKE Ol-YORK ISLAND. 133 5. O n a Collection of Crustacea made by the Rev. G. Brown, C.M.Z.S., on Duke-of-York Island. By E D W A R D J. M I E R S , F.L.S., F.Z.S., Assistant in the Zoological Department, British Museum. [Received February 19, 1877.] The Crustacea collected by Mr. Brown belong, with one exception (Lysiosquilla maculata), to the Decapoda, and amount in all to forty-four specimens, representing sixteen species. Although none of the species collected are new to science, several are interesting and little-known forms. I may particularly mention the Grapsodes notatus of Heller, originally described from specimens collected by the Novara Expedition at the Nicobars, and peculiar on account of the form of the carapace and structure of the orbital region; and the Sesarma rotundata of Hess, hitherto recorded only from Sydney, N e w South Wales. I have added a description of a remarkable species of Sesarma (S. teeniolata) in the British-Museum collection. The majority of the species collected by Mr. Brown are well-known forms, and generally distributed throughout the Tndo-Pacific region. ATERGATIS FLORIDUS. Cancer floridus, Linn. Syst. Nat. (ed. xii.) p. 1041 (1766). Cancer ocyroe, Flerbst, Naturg. Krabben u. Krebse, iii. (part 2) p. 20, pl. liv. fig. 2 (1801); M.-Edw. Hist. Nat. Crust, i. p. 375 (1834). Atergatis floridus, De Haan, Faun. Japon. Crust. (Dec. ii.) p. 46 (1835) ; A. M.-Edw. Nouv. Archiv. Mus. Hist. Nat. i. p. 243 (1865). One example, a female, of this very common and widely distributed Indo-Pacific species is in the collection. CARPILIUS CONVEXUS. Cancer convexus, Forskal, Descript. Animalium &c, Insecta, p. 88 (1775). Oarpilius convexus, M.-Edw. Hist. Nat. Crust, i. p. 382, pl. xvi. figs. 9 & 10 (1834) ; A. M.-Edw. Nouv. Archiv. Mus. Hist. Nat. i. p. 215 (1865). Two specimens, both females, are in the collection. This is also a very common species, and generally distributed throughout the Indo-Pacific region. In C. convexus the abdomen of the male is 6-, of the female 7-jointed; but in the males a small marginal fissure is usually to be observed on each side of the abdomen, marking the line of coalescence of the third and fourth segments. In the females the right chela is usually very large and massive. |