86 



manifest. The post-orl)ital crests are strongly sinuous, and have their edge 

 much broken up into Httle tubercles. 



In the male abdomen the 6th segment is elongate, but its sides are less 

 concave. 



The chelipeds in the male are much more unequal. 



The largest specimen (male) has a carapace Itt? inch long, 1| inch broad, 

 and ^ inch deep. 



E.i- ■'-■^^*. Ganjam in N. Cachar. Purchased. 5 c?,6 ? (including types). 



13. Patiatelphusa (Barytelphusa) pulvinata, Alcock. (Fig. 21.) 



This species, though coming from a far distant locality, is most closely 

 related to P. edentula. It is at once distinguished from everything in this 

 subgenus by the long, narrow, 6th abdominal segment of the adult male, and 

 by the remarkable convexity of the carapace, which is subcylindrical, as in 

 Gecai'cmucus. 



It differs from P. edentula in the following particulars : — 



The carapace is broader and verT/ much more convex; its length in the 

 adult female is three-fourths its greatest breadth, but in the adult male is con- 

 siderably less than this ; its depth much exceeds half its length. The loop made 

 by the cervical groove is longer and narrower. 



The front is more than a fourth the greatest breadth of the carapace even in 

 the adult male ; its edge is feebly sinuous, with an indistinct median convexity. 



The well-arched antero-lateral borders are subcristiform. 



The whole of the post- orbital portion of the crest of the carapace is sharp ; 

 the end of the crest does not always run quite into the small lateral epibranchial 

 tooth. 



In the external maxillipeds the merus is very slightly broader than long. 



In the male abdomen the two terminal segments are particularly long and 

 narrow ; in the 6th segment the sides are faintly concave, and the proximal and 

 distal breadth are equal, the breadth being only two-thirds of the length. 



In the adult male the disparity between the chelipeds is greater, the outer 

 sm-face of the merus is less rugulose, and one tooth in the dactylus as well as 

 one in the fixed finger is enlarged. 



In the legs the longest propodites are not twice as long as broad. 



In an adult male the carapace is IrV inch long, \]l inch broad, and Jfths 

 inch deep. 



This species has a remarkably strong resemblance to Gecareinucus. 



