J 900.] A. Alcock — Garcinological Fauna of India. 331 



outer surface is very finely and uniformly granular : the fingers are short, 

 especially in the larger hand, and meet only at tip, and at the base of 

 the dactylus of the larger hand is a molariform tooth. 



Legs tomentose : only 3 pairs are present, the 4th pair not being 

 represented even by a rudiment. The first pair, which are not much 

 longer than the chelipeds, are the shortest and slenderest : the next 

 two pairs, which are about equal in size, are not quite twice the length 

 of the carapace. 



Sternum very broad, finely and uniformly granular: in the male, 

 in the first sternal segment, on either side of the last abdominal tergum, 

 is a long narrow oblique trench, in which the ends of the modified 

 abdominal appendages are lodged. 



Male abdomen very narrow, not a fifth the breadth of the sternum 

 at its base. The first tergum is short fore and aft, the second is linear 

 and has a somewhat trilobed form, the 3rd 4th and 5th are fused to 

 form a sort of hexagonal plate with the distal end narrowed, the 6th 

 and 7th are separate. 



The anterior of the two pairs of male abdominal appendages 

 are most curiously modified: they are very long and stiff and are [, 

 shaped, and the proximal limb of the L ^ es beneath and parallel with 

 the abdomen, while the distal limb of the L emerges at right angles to 

 the abdominal tergum, and, instead of being free, lies in the special 

 sternal canal before mentioned. 



In the Indian Museum are 2 specimens, from the Bay of Bengal, 

 65 fathoms. The carapace is 4*5 millim. long and 7 millim. broad. 



Family II. PINNOTERID^E, Edw. 



Key to the Indian genera of Pinnoteridaa. 



I. Carapace ill-calcified : the ischium of the external 

 maxillipeds is indistinguishably fused with the much 

 enlarged merus : — 



1. Edges of the carapace swollen and ill-defined : 

 dactylus of the external maxillipeds small and 



often abnormally placed, but present Pinnoteres. 



2. The edge of the carapace, in all but its short 

 fronto- orbital portion, forms a thin upturned 

 crest : dactylas of the external maxillipeds 



wanting, or represented by a tiny pencil of hairs Xanthasia. 

 II. Carapace well calcified : the ischium of the external 

 maxillipeds is distinct and independent : — 



1. Ischium of the external maxillipeds much smaller 

 than the merus : dactylus of the external maxil- 

 lipeds very large, spathnlate. Orbits and eyes 

 normal, the orbits circular Tetrus. 



