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

CRUSTACEA. 243front and the absence of the woolly patch on the outer surface of thewrist.Litocheira hispmosa, Kinahan, from Port Phillip*, which in manyof its characters seems to be allied to Pseudor-liombila sulcatifrons, isat once distinguished by having but a single spine behind the exteriororbital angle. Specimens are in the Eritish-Museum collection fromPort Curtis {H.M.S. Herald ' '). Mr. Haswell, in his Catalogue,omits reference to this species, and to several others described byKinahan.The species described by Haswell as Eucrate crfflnis (Catalogue,p. 86) is, I think, identical with typical P. sidcatifrons (Stimpson).The type was from Holborn Island, near Port Denison (20 fms.).I have quite recently described, under the name P. sidcatifrons,var. atJanticaf, a specimen from Goree Island, Senegambia, whichis scarcely distinguishable from Oriental examples of this species.87. Ceratoplax arcuata. (Plate XXV, fig. B.)Carapace longitudinally convex, scarcely broader than long andnot wider behind than in the middle ; the surface, when viewedunder a lens of sufScitut power, is seen to be covered with a veryshort pubescence ; the sides are anteriorly arcuated, posteriorlyparallel : the antero-lateral margins, which are acute, are divided bythree slight notches, but can scarcely be described as dentated. Thefront foims with the antero-lateral margins a continuous curvedline ; it is somewhat deflexed, obscurely sinuated in the middle, withthe exterior angles rounded off and not prominent, and has somelonger hairs on its upper surface. The first two segments of thepostabdomcn in the male are very much shorter than the following,almost transversely linear in shape; the first segment, althoughlaterally produced, does not reach to the bases of the fifth ambulatorylegs. The eye-peduncles fit closely into the orbits (which are notdeep) and have their anterior and upper margins acute and clothedwith rather long hairs ; the small corneae are lateral, and are visibleonly in an inferior view. The epistoma is transversely linear ; theantennules transversely plicated ; the basal (or real second) antennaljoint is slender, and does not nearly reach to the inferior margin ofthe front (see fig. b) ; the flagellum is of moderate length. Thereare no distinct palatal ridges. The outer maxillipedes are broad inproportion to their length ; the ischium-joint little broader thanlong; the merus transverse, its extero-dorsal angle prominent. Thechelipedes are moderately large, the right a little the larger, and themargins of the joints are for the most part clothed with rather longhairs ; the carpus or wrist is angulated on its inner surface, withsome long hairs at the angle ; the palm is little longer than broad,and vertically deepest at the place of articulation with the mobilefinger, its margins are not cristatcd, its out^er surface smooth and* Jouin. Eoy. Dublin Soc. i. p. 121, pi. iii. fig. 1 (1858).t ndc Ann. & Mag. Nat. Hist. ser. b, viii. p. 259 (1881).r2