CKCSTACEA CASPIA. 473 



iug an acute angle, above wlucli a few small bristles are seen issuing from 

 the posterior edge. 



The urosome is rather stout, and has 2 very small spinules dorsally on 

 the last 2 segments, and on the terminal segment, also a single lateral 

 spinule. 



The eyes are of moderate size, and oval reniform in shape, with dark 

 pigment. 



The superior antenn;e (tig. 2) are scarcely more than twice as long as 

 the cephalon, and but sparsely setiferous. The 1st joint of the peduncle is 

 exceedingly large, almost equalling in lengtli the remaining part of the 

 antenna, whereas the last joint is extremely small, nearly as broad as it is 

 long. The flagellum about equals in length the last 2 peduncular joints com- 

 bined, and is composed of 5 articulations. The accessory appendage is about 

 half the length of the flagellum, and biarticulate, with the terminal articula- 

 tion very small. 



The inferior antenna? (fig. 3) are about the length of the superior, and 

 somewhat more densely supplied with delicate bristles, especially along the 

 posterior edge. The antepenultimate joint of the peduncle is rather broad 

 and expanded; the penultimate one gradually tapers distally, and projects at 

 the end anteriorly to a setiferous corner. The last joint of the peduncle is 

 much smaller than the penultimate, and simple cylindric in form. The flagellum 

 is very small, being scarcely longer than the last peduncular joint, and is 

 only composed of 3 articulations. 



The gnathopoda (figs. 4, 5), as in N. caspins, are very unequal in size, 

 the posterior ones being nearly twice as large as the anterior. In structure 

 they somewhat resemble those of the said species, but differ conspicuously 

 in the shape of the propodos. Whereas in N. caspius, the propodos of both 

 pairs is couically tapered, it is in this species, on the contrary, gradually 

 expanded distally, with the palm much less oblique, and defined below by a 

 distinct corner carrying 2 strong spines, one of which is remarkably elongated. 



The 2 anterior pairs of pereiopoda (fig. 6) are rather robust, and on the 

 whole agree in their structure with those in N. caspins. 



The 3 posterior pairs (figs. 7 — 9), on the other hand, are more slender 

 and less densely setous, differing also conspicuously in the shape of the basal 

 joint. In the antepenultimate pair (fig. 7) this joint is obliquely oval in form, 

 with the anterior edge strongly curved, and the posterior one somewhat 

 bulging in its proximal part. The basal joint of the penultimate pair (fig. 8) 

 is much more elongated, but remarkably narrow, being scarcely at all ex- 

 panded. The last pair (fig. 9) are highly remarkable for the large size of 

 the basal joint, which forms posteriorly a very broad lamellar expansion 



'l>ii3.-MaT. OTp. 803, 53 



