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

;CRUSTACEA. 283joints of the flagella almost naked. The scale at base of the antennaeis acuminate at its distal end, and between it and the peduncleis a strong spine, which is apparently. articulated with tlie antepenultimatepeduncular joint. The outer maxillipedes are subpediform,and the joints are hairy on their inner margins. The anteriorlegs are wanting in the single specimen I have seen ; the threefollowing legs have the joints somewhat compressed ; the merus andcarpus in the second legs are somewhat dilated and fringed belowwith loi]g hairs, the palm forming with the dactyl a perfect chela,the fingers of which are acute and meet along the inner edgesthe following legs are not subchelate ; the palm in the third pairis ovate, fringed with short stiff hairs below and on the sides,dactyl very short ; in the fourth pair the palm is somewhat slendererand more elongated, more thickly clothed towards its distalend with plumose hairs ; the fifth legs are shorter and comparativelyslender and feeble. The postabdominal appendages are biramose,the inner larger than the outer branch. The rami of the uropodaare somewhat indurated aud .considerably dilated ; their distal marginsare straight, ciliated, aud minutely spinulose, and they reachto the end of the terminal segment of the postabdomen. Colour(in spirit) whitish. Length about 1 inch 4^ lines (35 milHm.).The single example collected, which is, I think, a male, was obtainedon the beach between tide-marks at Port Molle (Xo. 103),and is in very imperfect condition.Although the anterior legs are wanting in this specimen, there can,I think, be no doubt of its generic position.4. Tlialassina anomala (Herhst).To this species probably belongs a female of rather small sizefrom Thursday Island, obtained in the mangrove-swamps (No. 124).In this specimen tlie chelipedes are of nearly equal size, and bothchelae are as slender and as much elongated as is the smaller chelain the adult T. aaomahi, and are strongly spinulose on their uppermargins.The examination of this specimen induces me to regard certain smallexamples (of both sexes) from Borneo, Singapore, and the IndianOcean which I formerly * referred to T. anomala, and which havea more broadly triangulate rostrum, and the upper margins of thewrists and hands of the chelipedes armed Avith much smaller spinulesalong their upper margins, as probably referable to a distinct species.White's T. talpa, however, is, as I have already stated, probably ayoung T. anomala.To the localities mentioned in my paper referred to above is to beadded Nicol Bay, N.W. Australia, whence the Museum possesses asmall mutilated example (31. du Boulay).Perhaps the species described by Hess t from Sydney as T. maximais to be regarded merely as a variety of T. anomala.* Ann. & Mag. Nat. Hist. ser. 6, v. p. 377 (1880).t Arcliiv f. >;aturgesehichte, xxxi. p. 163, pi. \ii. fig. 18 (1865).