Indian Deep-sea Crustacea. 281 



first to third nbdominal segments are continued down on tlie 

 plenrai of" these segments ; furthest down and most marked 

 on tlie first, the shortest distance and least marked on the 

 third. The first to fifth segments are also furrowed bj a 

 transverse groove in their posterior quarter running nearly 

 parallel to the hinder edge of each tergura, but bending 

 obliquely forward and downward on reaching the pleurae, 

 where they fade away before attaining the margin. The 

 fifth and sixth segments have an elevated horizontal ridge at 

 the union of the pleurae and terga, and the sixth possesses in 

 addition an elevated ridge passing obliquely upwards and 

 backwards from its articulation with the fifth segment to its 

 posterior margin. The sixth segment is very slightly longer 

 than the fifth. The telson lacks its extremity ; dorsally it is 

 widely grooved and on each side of the groove is an elevated 

 ridge ending posteriorly in a short sharp spine. From these 

 ridges the sides slope down obliquely, bear three minute 

 spinules on either side, and have their lower margins fringed 

 with hair. 



I'lie swimmeret is similar to that of Hah'porus thetis, only 

 differing in the sculpturing. 



The appendages appear to be very like those of Haliporus 

 thetis. 



The branchial formula is : — 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



XIII. 



XIV. 



There is not even a microscopic trace of any podobranch on 

 the epipodites of the second and third pairs of legs, while 

 that of the first pair is present on one side only. 



The exopodites of all the ambulatory legs are small but 

 plainly visible. 



The points in which this species differs from Haliporus 

 thetis are : — the larger branchiostegal spine situated at the 

 lower end of the frontal margin, and not some distance back 

 on the inferior margin ; the absence of the two bifurcations of 

 the carina on the carapace, the dorsal carina of the first abdo- 



