3i8 Records of the Indian Museum. [Vol. XVI, 



this elevated area are continued backwards in irregular fashion, 

 terminating in a cluster near the base of the last pair of legs. 

 There are also scattered granules on other parts of the carap- 

 ace, the gastric and cardiac regions excepted, and a few on cither 

 side of the basal part of the front near the insertion of the eye- 

 stalks 



In S. proxima the condition is different. The antero-lateral 

 portions of the carapace are only a little swollen, the surface 



sloping gently upwards and backwards 

 from the orbital border without any 

 indication of the abrupt declivity seen 

 in the allied species. The granules are 

 fewer and much less conspicuous, though 

 they may sometimes be traced back- 

 wards to the base of the last pair of 

 legs. The other parts of the carapace 

 are quite smooth and there are no tuber- 

 cles at the base of the front. 



When the carapace is viewed from in 

 front the lower orbital border appears 

 more strongly sinuous than in the allied 

 '''7;;vS.'-;,f?ov""" ^Pe^ies and the facet at its inner end 

 Endopod of second maxilli- ™ore sharply defined. 



ped. The third maxillipeds closely resemble 



those of S. investigatoris ; they do not, 

 however, show any trace of the obscure granules often seen in 

 large specimens of the latter species and there is merely a shallow 

 furrow parallel with the outer border of the merus, in place of 

 an incised groove. 



The chelipeds are short in both species and otherwise resemble 

 each other very closely. In S. proxima all three edges of the 

 merus are sharp and serrate, whereas in S. investigatoris the upper 

 edge, though compressed, is distinctly rounded. In the latter 

 species the inner limit of the upper surface of the carpus is defined 

 proximally by a short crest which is wanting in S. proxima. The 

 upper and lower borders of the palm are rounded in both species 

 and there is little difference in the shape of the chela ; the granu- 

 lation is, however, a little coarser in S. proxima and the teeth on 

 the prehensile edges of the fingers are larger and sharper. I have 

 not found any distinctions in the walking legs. 



The abdomen of the male of S. investigatoris has been figured 

 by Alcock, but the form of the fourth segment is not quite correct, 

 the distal angles being a little more produced than he has shown. 

 I give a fresh figure of the male and female abdomen (text-fig. 

 5) for comparison with those of 5. proxima (text-fig. 7). In 5. in- 

 vestigatoris the fourth segment in the male is broad distally with 

 produced outer angles, the fifth narrow, constricted at the base 

 and deeply channelled, the sixth longer than broad with parallel 

 sides. In 5. proxima there is a very deep constriction at the junc- 

 tion of the fourth and fifth segments, the anterior end of the 



