67 



Front narrow, forming a simple or bifid rostrum wliicli has a spine on either 

 side of its base. 



The orbits do not afford any concealment to the eyes, but form, on either 

 side of the rostrum, a broad concave facet sharply marked off from the rest of 

 the carapace by a ridge that arches round dorsally from the rostrum to the 

 antennal spine : at the upper and inner angle of this facet is a well defined 

 hollow that catches the knee of the 2nd and 3rd joints of the antennulary 

 peduncle when flexed. The eyes are well formed : the terminal joint of the eye- 

 stalk is barrel-shaped much as in Homola, but the slender basal joint is short or 

 obsolescent, so that the eyes do not appreciably project beyond the edge of the 

 orbital facet. • 



The mouth-parts are very like those of Homola, but as the outer border of 

 the merus of the external maxillipeds is hardly at all expanded these appendages 

 are even more pediform than in Homola. 



Chelipeds slender, spiny, equal. Legs of the first three pair long, with 

 broad compressed meropodites. Fourth (last) pair of legs short, very slender, 

 cheliform, their dactylus, which is many times shorter than their propodite, 

 shuttincr down against and co-termiuous with the slightly expanded distal end 

 of the propodite. 



The abdomen of both sexes consists of seven separate segments. 



Distrihufion: Arabian Sea and Bay of Bengal between 400 and 1000 

 fathoms. 



Eeij to the species of Hypsophrys. 



I. Rostrum simple: gastric region veiTUCOse ... ... ••• H. supercihosa. 



II. Rostrum bifid: gastric region spiuose ... ••. ••■ H. longipes. 



Hiipsophrijs supercUiosa, Wood-Mason. Plate VI., fig. 2-i. 



E,jvsovhrv. suferciUosa, Wood-Masoa. Aan. Mag. Nat. Hist., March 1891, p. 263: 111. Zool. Investigator, 

 Crast., pi. xiv., figs. 4, ia : Aloock II. cit. 



Rostrum simply pointed. Linea anomurica rather indistinct. 



Four small spines or teeth on the anterior (orbital) border of the carapace, 

 two being far apart at the base of the rostrum and one at either outer orbital 

 ano-le. Two, or all four, of these teeth may be obsolescent or obsolete. 



Lateral borders of dorsum of carapace not defined, except by a single 

 isolated spine on the hepatic region. Gastric region sharply subdivided into 

 three subregions, of which the lateral are somewhat nodular. Two or three 

 spines on 'the subhepatic and suborbital region, the innermost of which is 

 " antennal," also sometimes a few spinules. 



