176 A. Alcock — Carcinologiccil 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, hut differ in having the lower edge of the ischium and merus 
strongly spinate. The legs are slender and filiform, about one-fourth of 
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. 
Male. 
Female. 
Length of carapace 
7*2 millim. 
... 8*5 millim. 
Breadth of carapace 
6-0 „ 
... 7*0 „ 
Length of legs of 2nd trunk-segment 
28-0 „ 
... 28-0 „ 
55 55 3rd ,, 5, 
320 „ 
... 32-0 „ 
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 Physachseus 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 
