46 

 22. Gennadas carinatus, (S. I. Smith). 



Btnthesicymus f carinahts, S. I. Smith, Albatross Crust., in Rep. U. S. Fish. Comm. for 1882, p. 396, pi. at. figs. 

 6-7 : Alcock and Anderson, Journ. As. Soo. Bengal, part 2, Vol. LXIII. 1894, p. 147. 



Integument membranous, flaccid. 



Kostrum not reaching to the end of the eye-stalk, unarmed, continued as a 

 sharp carina to the well-cut cervical groove. The longitudinal ridge that bounds 

 the branchial region superiorly runs, with a break at the cervical groove, into 

 a weak post-antennal spine. The suborbital angle is sharp, and behind it there 

 is a longitudinal crest. The hepatic region is defined by a ridge. 



The abdominal terga from the 3rd to the 6th, both included, are carinated. 

 The 6th abdominal somite is a little more than twice the length of the 5th. 

 Telson as long as the endopodite of the caudal fan, armed cfa either side at the 

 far end with 4 spines. 



Eyes not much broader than the stalk : tubercle of the eyestalk acute. 

 Antennular flagella broken, the upper flagellum is thickened at base. Antennal 

 scale about a third as long again as the antennular peduncle. 



The dactylus of the external maxillipeds though broad at base ends acutely, 

 and has some tiny spinules along its convex border. 



Abdominal appendages lax and feathery, the exopodites of the 1st pair are 

 longer than the carapace and rostrum : between the bases of the 1st pair is, in 

 the male at least, a sternal tubercle. 



The " andricum " consists of a pair of simple leaves which are not in contact 

 when not in use. 



In the only Indian specimen the carapace and rostrum are 51 millim. long, 

 and the abdomen is 84 millim. measured in the mid-dorsal line. 



Arabian Sea, near the Laccadive Islands, 902 fathoms. 



23. Gennadas parvus, Spence Bate. 



Oennadas parvus, Spenco Bate, Ann. Mag. Nat. Hist., Sept. 1881, p. 192, and Challenger Crustacea llacrura, 

 p. 340, pi. lix : Wood-Mason, Ann. Mag. Nat. Hist., Feb. 1891, p. 189 and Oct. 1891, p. 286. 



Submembranous, glabrous. 



Rostrum very short, not reaching nearly halfway along the eyestalk, armed 

 dorsally with a single tooth, its carina is very distinct as far as the well-cut 

 cervical groove, behind which it is traceable as a faint ridge nearly to the 

 posterior "border of the carapace. A weak post-antennal tooth is the only 

 armature of the carapace. 



