1895.] A. Alcock — Carcinological Fauna of India. 255 



The chelipeds in the male have the palms enlarged, and the fingers 

 either arched and meeting only at the tip, or not. The ambulatory legs 

 are rather short. 



This genus might, without any unnatural stretch, be included with 

 MicippoideS, A. M.-Edw. (Journ. Mus. Grodeffr. I., Crust., p. 254). 



Macrocoeloma nummifer, n. sp., Plate IV. fig. 4. 



Closely allied to Macrocoeloma concava, Miers, ' Challenger ' Bra- 

 chyura, p. 81, pi. x. fig. 2 ; and to Entomonyx spinosus, Miers, Zoology 

 H. M. S. 'Alert,' p. 526, pi. xlvii. fig. B. 



Carapace rather more than j longer than broad, with the regions 

 well-defined : its surface is regularly and sharply tubercular and is arm- 

 ed with two sharp spines — one behind the other — on the gastric region, 

 two larger — side by side — on the cardiac region, two still larger — one 

 obliquely behind the other — on the lateral epibranchial region, and two 

 very small ones — one behind the other — on the intestinal region. 



The rostrum consists of two straight sharp slightly diverging spines, 

 which are about one-fifth or one-sixth the length of the carapace proper, 

 and which in the male are slightly deflexed, but in the female are strong- 

 ly deflexed. 



The basal joint of the antennas is broadly obtriangular ; its antero- 

 external angle is produced to aid in forming the floor of the orbit — this 

 orbital process having its free margin deeply excised ; its antero-inter- 

 nal angle carries a stout vertically directed tooth. The orbits, which 

 are in the form of large deep projecting tubes with jagged lips, are con- 

 stituted as in Micippa. 



The chelipeds are closely and sharply granular as far as the Augers: 

 in the male they are much stouter than the other legs, are nearly 

 as long as the carapace and rostrum, and have large broad palms, and 

 strongly arched fingers that meet only at the tip. In the female the 

 chelipeds, although not much shorter than those of the male, are 

 hardly stouter than the other legs, and have fingers that can be closely 

 apposed throughout their extent. 



The ambulatory legs are slender : in all the meropodite has its 

 posterior margin minutely spinulose, and has a spine on the far end of 

 the upper margin : the first pair, which are the longest, are a little 

 longer than the chelipeds. 



The rostrum carapace and legs are beset with stiff curly hairs. 



The abdomen in both sexes consists of seven distinct segments. 



This species commonly encrusts itself with a plate armour of 

 Orbitolites, rounded fragments of Nullipore, &c. 



