BRACHYDRA. RATHBUN. 125 



inner margin with two unequal spines, surfaces punctate 

 and nearly smooth. The ischium bears a few blunt spinules 

 on inner margin. The carpus is armed with long spines 

 (right 14, left 12) one of which is erect at the inner angle. 

 In the male the outer surface of the large hand may be 

 divided somewhat obliquely into two unequal parts, the 

 upper and larger part spinous and hairy, the lower part 

 smooth and naked; the spines are arranged in six rows 

 and those of large size number about twenty, but toward 

 the distal and lower borders the spines diminish in size, 

 becoming conical tubercles. A patch of hair and blunt, 

 spinous tubercles at base of dactylus above. The rows of 

 spines and tubercles cover the outside of the small hand 

 and are arranged in seven rows, of which two rows are 

 continued slightly on the fixed finger. 



In the female the larger hand is practically entirely 

 covered outside with spines, which become smaller below. 



The merus joints of the ambulatory legs have a row of 

 several curved spines on the upper edge, the carpus has 

 three long spines above, except in the last pair, only two. 



Relationships. This species is near P. vestitus, Haswell, 15 

 having the same shaped carapace and front, a border of 

 spines, a spine at either end of orbit, a similar arrangement 

 of spines on chelipeds and ambulatory legs. It differs from 

 vestitus in having the hairs arranged singly instead of in 

 bunches, in the fainter areolation, narrower and more 

 deeply separated frontal lobes, in the character of the 

 lateral spines whose bases are cylindrical, not conical, in 

 the spines of the wrist few and long instead of numerous 

 and short, in the longer ambulatory legs, with one or two 

 more spines on each merus and much longer spines on the 

 carpal segments. 



The species also has a resemblance to P. terra-regina, 16 

 which has a granulate carapace, no spine outside the orbit, 

 wrist rough with granules instead of spines, and unarmed 

 legs. 



10 Haswell Proc. Linn. Soc. New South Wales, vi., 1881 (1882), 

 p. 753. 



16 Haswell loc. cit., p. 752. 



