Male. 



Female. 



7-2 millim. 



8"5 raillim. 



6-0 „ 



... 7-0 „ 



28-0 „ 



... 28-0 „ 



320 



... 32-0 „ 



176 A. Alcock — Carcinological Fauna of India. [No. 2, 



have much the same form as, though slenderer proportions than, those 

 of Stenorhynchus, but the merus is much more strongly and elegantly- 

 curved : the merus and carpus are moderately inflated, the former joint, 

 like the ischium, having its lower edge more or less granulate : the 

 palm is compressed, with the edges denticulate : the fingers are strongly 

 compressed, and have the cutting edges accurately and completely 

 apposable throughout, being denticulate near the tips only. 



In the female the chelipeds have the same general form as in the 

 male, but differ in having the lower edge of the ischium and merus 

 strongly spinate. The legs are slender and filiform, about one-fourth o£ 

 their length being contributed by the filamentous dactylus : those of 

 the third trunk-segment are the longest, being about four times the 

 length of the carapace, rostrum included, and more than two-and-a-half 

 times the length of the chelipeds. 



Length of carapace 

 Breadth of carapace 

 Length of legs of 2nd trunk-segment 

 ,, n ^ r( l ii " 



Numerous males and egg-laden females from the Andaman Sea, 

 240 to 375 fathoms. 



The eggs are few in number and are singularly large, those from a 

 female of the dimensions given above being over a millimetre in 

 diameter. 



Physachseus tonsor, n. sp. Plate III. fig. 3. 



The female, which is the only sex represented in the collection, 

 differs from the female of Physachaeus ctenurus in the following 

 particulars : — 



(1) the gastric region of the carapace, instead of a single large 

 spine, has several smooth tubercles ; and the large spine behind the 

 cardiac region is coarser, and is recurved instead of procurved : the 

 post-ocular constriction is less marked : 



(2) the abdominal carina ends in a spine, and the sixth tergum has 

 its after edge perfectly smooth instead of quadrispinate : 



(3) the eye-stalks are larger, and are compressed instead of 

 cylindrical : 



(4) the chelipeds are relatively stouter, being of much the same 

 proportions as those of the male of Physachaeus ctenurus : their merus is 

 compressed and has its lower border very strongly and sharply carin- 

 ated : the hands are much thinner and more compressed ; the palm 



