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

;556 COLLECTIONS FROM THE WESTERN INDIAN OCEAN.tudiual, and cervical sutures well defined ; there is no median rostrallobe, and the lateral lobes of the frontal margin (situate betweenthe e3'es and antennse) are obtuse and little prominent. Theselateral margins are armed with a few very small spinules at andbehind the antero-lateral angles ; the branchial regions are moderatelydilated. The sternum between the bases of the fourth pairof legs is of considerable width, and the coxse of this and of thethird pair widely remote from one another, but those of the firstand second pair are contiguous. The pOstabdomen (in the female)bears three triramose ciliated appendages, and in the middle of itsinferior surface a strong conical and somewhat hairy fleshy protuberance; above it is protected by membranaceous plates ; itsterminal segment is very small. The eye-peduncles are thickenedsomewhat distally, and are somewhat longer than the anteriormargin of the carapace ; their cornese are small and occupy about afifth of the total length ; their basal scales are as broad as long anddenticulated on the distal margins at and near the antero-internalangles. The peduncles of the antennae are rather shorter than theeye-peduncles; the antepenultimate joint is armed above with astrong setose spine, at base of which is a smaller spine ; the two lastpeduncular joints are slender; the joints of the flagella nearly naked.The larger (left) chelipede has a trigonous merus-joint, whose uppermargin is not toothed, but whose lower margin has about half adozen irregular spines and teeth ; the carpus is spinulose on all itsupper and outer surface ; the palm (nearly twice as long as thewrist) has its upper and half of its outer surface spinulose,but the lower half of its outer surface smooth, except at theinferior and proximal angle ; the lower margin, both of palmand immobile finger, is thin-edged, straight, and spinulose ; theinner surface of the palm has a few granules on its upper partthe mobile finger is spinulose above, near the base, and both fingershave their apices subacute, with only very small corneous tips. Inthe slender smaller chelipede both wrist and palm are spinulose andhairy on their upper and outer surface, the fingers are sub-excavateat apex, with corneous tips, the upper spinulose at base; the secondand third legs are slender and rather hairy, with the dactyli slender,arcuated, and much longer than the preceding joints ; on the leftside the second legs have the penultimate and last joints spinuloseabove, but nearly smooth on the outer surface ; the terminal jointexternally longitudinally canaliculated ; the third (left leg) has itspenultimate joint spinulose all over the outer surface ; its terminaljoint is broken, but was apparently externally longitudinally canaliculatedand strongly spinulose above ; in the fourth legs the penultimatejoint terminates as usual in a scabrous pad, and the dactjdis arcuate and denticulated on its inner margin ; the fifth legs areapparently more distinctly chelated, and are densely hairy at thedistal extremity. The chelipedes and ambulatory legs are ratherscantily clothed with hair. Coloration (in spirit) yellowish withreddish patches (interpunctulatcd with white) on the postfrontalregions of the carapace, chelipedes, second and third legs. Length