150 Cardiological Fauna of India, 



pronounced endostomial septum, and the slender basal-antennary joint 

 are the other important points of difference. 



10. Mursia bicristimana, Alcock and Anderson. 



Mursia bicristimana, Alcock and Anderson, Journ. Asiatic Soc. Bengal, Vol. 

 LXIII. 1894, pt. 2, p. 179; and 111. Zool. 'Investigator' Crnst. pi. xxiv. fig. 5 

 (w the press). 



The length of the carapace is about seven-ninths of the breadth 

 immediately in front of the lateral epibranchial spine ; and the length 

 of the epibranchial spine is from one-third (in the young) to less than 

 one-fourth (in the adult) the length of the carapace. 



The surface of the carapace is closely granular, and in addition 

 there are seven rows of tubercles, one in the middle line, and three on 

 each side radiating over the branchial regions : the antero-lateral 

 margins are finely beaded and evenly and sharply festooned : the 

 postero-lateral margins are without the angular bend inwards seen in 

 M. armata : the posterior margin is bounded on either side by a laminar 

 denticle, not by a great projecting lobule as in M. armata. 



The outer parts of the pterygostomian and subhepatic regions are 

 covered with a dense felt of long hairs. 



The rostrum is trilobed, its breadth at the level of the lobes being 

 about one half more than the greatest breadth of the orhit. 



The transverse ridge near the distal end of the arm is very hairy, 

 and is armed distally with two spines, the outer and larger of which is 

 more than half the length of the lateral epibranchial spine. This ridge 

 is continued along the palm as a sharp longitudinal crest (more prominent 

 even than that of Platymera) which is unevenly trilobed, the proximal 

 lobe being spiniform, the middle lobe broad and obtuse, and the distal 

 lobe narrow and obtuse. The upper surface of the wrist, and the outer 

 surface of the palm and fingers, are closely and sharply granular : the 

 upper edge, or crest, of the palm is 7- serrate. 



The ambulatory legs are large stout and compressed, those of the 

 first three pairs being a little longer than the chelipeds. In these three 

 pairs the meropodite is lamellar, its greatest breadth being considerably 

 more than a third its length ; the carpus has its outer surface traversed 

 longitudinally by three beaded carina?, the middle one of which ends 

 in a spine ; and the propodite is lamellar with the outer (anterior) edge 

 subcarinate and the upper surface traversed longitudinally by two or 

 three raised lines of fine beading. 



The second abdominal tergum in both sexes is raised into a stout 

 carina, the height of which is more than a third the transverse diameter 

 of the tergum : this carina is three lobed, the lobes being separated only 



155 



