193 



The median carina of the carapace is very distinct at the posterior border 

 :uid also on the gastric region. On the gastric region is a series of antrorse 

 spines arranged in the form of a long narrow horseshoe with the convexity 

 forwards. 



There are some very long and lank retrorse setae on the abdomen : the 

 abdominal terga are subcarinate, the pleura behind the 1st are broad but some- 

 what angular, the edges of the telson and the outer edge of the outer caudal 

 swimmeret are serrated, as also is the edge of the transverse suture. 



The eyes show as an irregular speck of pigment on the outer side of the 

 tip of the short fixed eyestalks. There are no spinules on the outer edge of the 

 expanded basal portion of the 1st joint of the antennular peduncle. The 

 scaphocerite and stylocerite of the antennal peduncle are similar to those of 

 C. investigatoris. 



The large chelipeds of the female are more than half the length of the body, 

 and all that part of them which lies beyond the carapace is rather thickly setose : 

 the lower border of the ischium has a single spine, the lower border of the 

 merus 2 spines, and the upper border of the merus a single terminal one; 

 both borders of the carpus and palm are serrulate or serrate : the fingers are as 

 long as the palm, and the palm is a good deal longer than the wrist ; the fixed 

 finger, the tip of which is truncated, has near its proximal end 2 or 3 small 

 . teeth followed by a much enlarged one. 



In the 3rd and 4th pairs of legs the long propodite and short pointed 

 dactylus have, in addition to some long lank setae, some squamiform rows of 

 short stiff setae. In the 5th pair of legs the last two joints have only a few 

 long setaa, and the dactylus is subspathulate. 



Length of carapace and rostrum, measured in the middle line, 18 millim., 

 of abdomen 24 millim. 



Arabian Sea, off Cape Comorin 430 fathoms. 

 Regd. No. ^ (Type of the species). 



ICONAXIOPSIS n. gen. 



If Spence Bafce's figure of the 2nd maxillipeds of Iconaxius acutifrons is correct, and if his 

 branchial formula of the same species is to be relied on, the Indian species that have hitherto 

 been assigned to this genus must be separated as a distinct genus agreeing with Iconaxitts in all 

 respects except the following : 



( 1 } the 2nd maxillipeds have the exopodite much longer than the endopodite, and in addition 

 to the foliaceous epipodite, they carry a podobranch and an arthrobranch, each of which consists 

 of a tapering plate one edge of which is minutely and distantly plumose : 



(2) there are well developed pleurobranchiffi to the somites XI. XII. XIII. 



Carapace much shorter than the abdomen, somewhat compressed, deeply 

 excavated in the middle line posteriorly, without any grooves or sutures except 

 25 



