24 



the branchial region superiorly and the ridge denning the branchial channel are 

 very distinct. 



The 4th, 5th and 6th abdominal terga are sharply carinated : the 6th 

 abdominal somite is about half again as long as the 5th. Telson " trifurcate," 

 shorter than the endopodite of the caudal swimmeret. 



Byes laro-e, reniform, their major diameter at least twice that of their stalk. 

 Outer antennular flagellum more than twice as long as the inner, and at 

 least as long as the entire body. 



External maxillipeds about as long as the third pair of thoracic legs. Last 

 two pairs of legs flagelliform, the last, which is a little the longer of the two, 

 being at least as long as the entire body. 



The tubercles that carry the openings of the oviducts are of very large 

 size and hirsute : behind them the " thelycum " is formed (1) by a transverse 

 sternal crescentic plate bounded posteriorly by (2) a pair of transverse processes 

 derived from the coxa? of the 4th pair of legs, which are followed (3) by a median 

 sternal shield-shaped tubercle, behind which is (4) the concave posterior edge 

 of the sternum, notched in the middle line. 



The " andricum " of the first pair of abdominal appendages is a pair of 

 equal lobes that form a canal by their interlocking : each lobe ends in two 

 rounded lobules of slightly unequal size the inner of which is nicked at tip, 

 and as the outer lobule is notched at base there is an appearance of a third lobule 

 further back. 



In the largest female the carapace is 34 millim. long (rostrum included) 

 and the extended abdomen 51 millim. long, the measurements being in the mid- 

 dorsal line. 



Colours in life, pink. 



Not uncommon in the Andaman Sea from 250 to 500 fathoms, Arabian Sea 

 406 to 703 fathoms, and off Ceylon 195 to 597 fathoms. 



It seems to me more than doubtful whether this species is really distinct 

 from Spence Bate's Haliporbus obliquirostris. 



„ . „ 8521 S574 4271-4272 3116-3117 3173 3192 B720-6726 9274 291-296 



Regd. Nos. — : — : j : — 5 — : — : — • —5 • — • — 33— • 



507-510 1483 



10 * 10 



7. HaliporUS neptUTlUS, Spence Bate. 



Haliporus neptunus, Spence Bate, Ann. Mag. Nat. Hist., Sept. 1881, p. 185, and Challenger Crustacea 

 Maorara, p. 291, pi. xlii. fig. 3 : Wood-Mason, Ann. Mag. Nat. Hist,, Oct. 1891, p. 27K. 



This species agrees at almost all points with H. sequalis, from which it may 

 be distinguished by the following characters : — 



The rostral carina' is continued backwards as a distinct carina nearly to the 



