10 Major A. Alcock and Capt. A. R. S. Anderson on 



being the hand and fingers and part of the arm of the larger 

 cheliped of the male. 



The colours in life are described by Dr. A. E. Anderson as 

 " white, with a bluish tinge, eyes with _ a slight reddish 

 opalescence." In spirit the bluish tinge is fainter, the eyes 

 are a pale milky yellow-ochre, and the large hand is ivory- 

 white. 



The dimensions of the largest male are as follows : — 



millim. 



Length of carapace 18 - 5 



Breadth of carapace 14*5 



Combined length of hand and fingers along lower border. . 1475 

 Combined length of basal joints, arm, and wrist along 

 upper border 15 



Fifteen specimens were dredged off the Travancore coast 

 at a depth of 430 fathoms. The bottom consisted chiefly of 

 coral (living and dead). 



Several of the specimens were egg-laden females. The 

 eggs are comparatively few in number and are large, their 

 diameter being about 1*3 millim. 



This species is very like Tr achy car cinus corallinus, Faxon, 

 which was dredged by the ' Albatross ' off Panama and the 

 Pacific coast of Mexico at depths of 546-695 fathoms. It 

 differs from that species in the following particulars : — 



The carapace is more granular and its lobules are capped 

 by blunt conical spinules, not smooth tubercles, and its poste- 

 rior border is finely and irregularly beaded, not dentate. 



The front is deeply cut into three spines or prongs of 

 almost equal size, not into three teeth of which the middle 

 one is larger than the others. 



The eyes, though very pale, are distinctly pigmented, not 

 devoid of pigment. 



The inner angle of the wrist of the smaller cheliped is 

 very strongly spiniform, not unarmed. 



As Mr. Faxon says, Tr achy car cinus is very closely related 

 to Trichopeltarium ; in fact, the relation is so close as to make 

 the separation of the two forms almost doubtful. 



Family Portunidae. 

 Benthochascon Hemingi, gen. et sp. n. 



Closely related to Bathynectes. 



Carapace subquadrilateral, its length about \ its breadth, 



