36 



smooth : the inner angle of the wrist is produced, and the fingers, which are 

 arched and spooned at tip, are shorter than the palm. 



When the legs are denuded they are smooth except for some coarse and 

 inconspicuous serrations of the anterior border of the merus and carpus and for 

 a series of small teeth along the posterior border of the stout dactylus. 



The last pair of legs are slender rudiments. 



There are no vestiges of any appendages on the 3rd-5th abdominal somites 

 of the male. 



In the single specimen the carapace is 10 millim. long and a little over 11 

 millim. in greatest breadth. 



-— — . (Type of the species). Off Kiltan I., Laccadives. 50-30 fathoms. " Investigator." 



Differs from D. hisjnda in the form of the carapace, the outline of which is 

 nearly a circle ; in the non-serrated orbital edges, and the non-spinulose chelipeds 

 and legs : from D. prxdator in having the antero-lateral borders of the carapace 

 cut into 5 spiniform teeth, and the wrist of the chelipeds of normal form : from 

 D. Ursula, in having the pterygostomian regions smooth and the legs and chehpeds 

 non-spinulose : from D. filhoH in having no rudimentary appendages on the 3rd- 

 5th abdominal somites of the male : and from D. pugnatrix in having the carapace 

 almost circular, the lower edge of the orbit non-serrated, the legs non-spinose, 

 and the chelipeds of normal form. 



AcANTHODROMiA, A. Milne Edwards. 



^ca;i»ioc!ramia, A. Jlilne Edwards, Bull. Jlus. Comp. Zool., 1880, p. 31 : E. L. Bouvier (12), Ortmann (84), 

 Alcock (3). 



For references see Alcock, J. A. S. B., LXVIII., pt. 2, 1899, p. 13-1. 



Differs from Dijnomene in having the carapace longer than broad, convex, 

 and closely covered with spines instead of hairs. 



Distribution: Caribbean Sea and Andaman Sea, in depths of 75 to 150 

 fathoms. 



Acanthodromia margarita, Alcock. Plate I., figs. 3, Sa. 



Dynomcne margarita, Alcock, Investigator Deep-Sea Brachyura, p. 19, pi. ii„ fig. 3, 



The whole carapace and dorsal surfaces of the chelipeds and legs are as 

 closely as possible covered with spines and spinules : the under surfaces of the 

 body and legs, the eye-stalks, antennte, and external maxillipeds are closely and 

 crisply granular. 



On the middle of the fourth abdominal tergum is a pair of large smooth 

 tubercles, exactly like pearls, in the closest contact with one another. 



