1896.] A. Alcock — Carcinohgical Fauna of India. 2^9 



The antcnnules arc large, but do not fold into fosscttcR. The an- 

 tennae also are large, and arise on a plane more or less ventrad of the 

 antennules. 



The buccal cavern is remarkably elongate, and is completely closed 

 by the extei-nal maxillipeds. As in all other Oxystoma the efferent 

 branchial channels form a canal in the middle of the endostome, which 

 canal is covered by a lamellar prolongation of the exopodites of the first 

 maxillipeds : as in Dorippe the canal is prolonged forwards between the 

 bases of the antennules. 



As in the Leucosiidse the afferent branchial channels are not found 

 in front of the bases of the chelipeds. 



Somewhat in the same way as in the LeucosiidiB the palp of the 

 external maxillipeds is small and arises at the far end of a groove along 

 the inner edge of the merus, so as to be completely concealed in repose : 

 the exognath is very narrow, and, as in the Tymolinw, does not reach 

 very far beyond the end of the ischium of the endognath. 



Except in ZancUfer the chelipeds have the hand broad flat and 

 somewhat chopper-shaped, the fingers (which form the head of the 

 chopper) being at right angles, or nearly so, with the long axis of the 

 hand ; and as the immobile finger springs from a very broad base, the 

 chelae rather resemble subchelae. 



The legs commonly have the propodite broad or foliaeeous, and the 

 dactylus foliaeeous or very broadly palmulate, somewhat as in Matuta : 

 the last pair of legs is in, and the penultimate pair approaches, the 

 dorsal plane of the body. 



The genital ducts of the male perforate, and protrude far beyond, 

 the bases of the fifth pair of legs : those of the female perforate the 

 bases of the third pair of legs. 



The following genera belong to this family. Indian genera are 

 printed in Roman type and those represented in the Indian Museum 

 collection are marked with an asterisk : — 



Family Raninidae. 



* Cosmonotus. 



* Lyreidus. 



* Notopus. ^ 

 Notopoides, Henderson, ' Challenger ' Anomura, p. 29. • 

 Banilia, Milne Edwards, Hist. Nat. Crust. II. J 95. 



* Banina, Lamarck, Milne Edwards, Hist. Nat. Crust. II. 191. 



* Raninoides. 



Jiam'nops,A.Milne Edwards,Bull. Mus. Corap. Zool. YITT. 1880, p, 34. 

 ZancUfer, Henderson, ' Challcnf>er ' Anomura, p. 34, 

 J, 11, 37 



