556 COILECTIONS FEOM THE WESTERN INDIAN OCEAN. 



tudinal, and cervical sutures well defined ; there is no median rostral 

 lobe, and the lateral lobes of the frontal margin (situate between 

 the eyes and antennae) are obtuse and little prominent. , These 

 lateral margins are armed with a few very small spinules at and 

 behind the antero-lateral angles ; the branchial regions are mode- 

 rately dilated. The sternum between the bases of the fourth pair 

 of legs is of considerable width, and the coxae of this and of the 

 third pair widely remote from one another, but those of the first 

 and second pair ai'e contiguous. The postabdomen (in the female) 

 bears three triramose ciliated appendages, and in the middle of its 

 inferior surface a strong conical and somewhat hairy fleshy pro- 

 tuberance ; above it is protected by membranaceous plates ; its 

 terminal segment is very small. The eye-peduncles are thickened 

 somewhat distally, and are somewhat longer than the anterior 

 margin of the carapace ; their corneas are small and occupy about a 

 fifth of the total length ; their basal scales are as broad as long and 

 denticulated on the distal margins at and near the antero-intemal 

 angles. The peduncles of the antennae are rather shorter than the 

 eye-peduncles; the antepenultimate joint is armed above with a 

 strong setose spine, at base of which is a smaller spine ; the two. last 

 peduncular joints are slender; the joints of the flageUa nearly naked. 

 The larger (left) chelipede has a trigonous merus-joint, whose upper 

 margin is not toothed, but whose lower margin has about half a 

 dozen irregular spines and teeth ; the carpus is spinulose on all its 

 upper and outer surface ; the palm (nearly twice as long as the 

 wrist) has its upper and half of its outer surface spinulose, 

 but the lower half of its outer surface smooth, except at the 

 inferior and proximal angle; the lower margin, both of palm 

 and immobile finger, is thin-edged, straight, and spinulose ; the 

 inner surface of the palm has a few granules on its upper part ; 

 the mobile finger is spinulose above, near the base, and both fingers 

 have their apices subacute, with only very small corneous tips. In 

 the slender smaller chelipede both wrist and palm are spinulose and 

 hairy on their upper and outer surface, the fingers are sub-excavate 

 at apex, with corneous tips, the upper spinulose at base; the second 

 and third legs are slender and rather hairy, with the dactyH slender, 

 arcuated, and much longer than the preceding joints ; on the left 

 side the second legs have the penultimate and last joints spinulose 

 above, but nearly smooth on the outer surface ; the terminal joint 

 externally longitudinally canaliculated ; the third (left leg) has its 

 penultimate joint spinulose all over the outer surface ; its terminal 

 joint is broken, but was apparently externally longitudinally canali- 

 culated and strongly spinulose above ; in the fourth legs the penul- 

 timate joint terminates as usual in a scabrous pad, and the dactyl 

 is arcuate and denticulated, on its inner margin ; the fifth legs are 

 apparently more distinctly chelated, and are densely hairy at the 

 distal extremity. The chelipedes and ambulatory legs are rather 

 scantily clothed with hair. Coloration (in spirit) yellowish with 

 reddish patches (interpunctulated with white) on the postfrontal 

 regions of the carapace, chelipedes, second and third legs. Length 



