58 



oblique squamiform markings, and the well-defined suborbital lobes are 

 sparsely rugose. 



Front strongly deflexed, less than a third the greatest breadth of the 

 carapace, its edge smooth and slightly sinuous ; immediately behind its fi'ee 

 edge is a pair of lumpy elevations much like those of Potamon pealianvm. 

 Upper edge of orbit sinuous, smooth ; external orbital tooth distinct but not 

 salient, the notch between it and the lower border of the orbit almost 

 obsolete. 



An tero- lateral borders of carapace raised, gently curved, crenulate ; 

 epibranchial tooth distinct but obtuse. 



Epigastric and post-orbital crests strongly and sharply defined ; usually 

 they run an oblique and slightly sinuous course, without break or fissure, from 

 the middle line to the lateral epibi'anchial tooth, with which they are 

 continuous, but sometimes they are obscurely notched near the line of the 

 inner angle of the orbit, and also near the outer angle of the orbit. 



In the male abdomen the 6th segment is twice as broad as long, and the 

 7th is as long as broad. 



Antennular fosste narrow ; 1st (true 2nd) antennal joint short and broad, 

 the succeeding joints overlapped by the front. 



Palp of mandible simple. Exopodite of external maxillipeds longer 

 than ischium, without a flagellum or w^ith only a vestige of one ; merus of 

 external maxillipeds about as long as broad. 



Chelipeds a little unequal ; merus with serrulate edges and with 

 squamiform granules on its outer surface ; carpus with squamiform wrinkles 

 on its exposed surfaces and small tubercles along its inner edge, and with the 

 usual buttressed spine at its inner angle ; upper and outer surface of palm, 

 and base of upper surface of dactylus, studded with small tubercles ; palm of 

 larger cheliped nearly as high as long and somewhat inflated ; fingers stoutish, 

 fluted and pitted, about as long as palm, not gaping much when closed. 



Legs fairly stout, 2nd (longest) pair as long as chelipeds ; dactyli longer 

 than their propodites, propodites of 2nd and 3rd pairs more than twice as long 

 as broad. 



In the largest female the carapace is 1 inch long, 1^ inch broad, and 

 slightly over J inch deep. 



. Nemotha, Cachar. J.Wood-Mason. ,. , , . ' . s 



9 (including types) 



5453 



Nemotlia, Cachar. J. Wood-Mason. 1 $ , 



POTAMON (POTAMISCUS ?) TUMIDULUM, Alcock. 



This species, from Sikkim, has already been described (see jj. 43). The 

 flagellum of the exopodite of the external maxillipeds is a mere vestige, and 



