CRUSTACEA CASl'tA. 437 



posterior pairs the penultimate one (fig. 1 5) is the longest, and has the basal 

 joint somewhat larger than in the antepenultimate pair (fig. 14), though 

 exactly similar in shape, both being oblong oval and somewhat narrowed 

 distally. The last pair (fig. 1 6) are prominently distinguished by the large 

 size of the basal joint, wliich is greatly expanded, and almost cordiform in 

 shape, its greatest breadth occurring in its distal part. The strongly curved 

 edge of the expansion is minutely crenulated, and fringed with short bristles. 



The 2 anterior pairs of uropoda (fig. 17) are normally developed, with 

 the rami subequal, and armed at the tip with a dense bundle of strong spines. 



The last pair of uropoda (fig. 18) are comparatively short and thick, 

 extending but little beyond the others, and on the whole resembling those 

 in the genus AmathilUna. As in that genus, the outer ramus is rather thick, 

 and slightly curved, with a small terminal joint, and carrying on each side 

 a limited number of fasciculated spines, accomjjanied by a few slender 

 bristles. The inner ramus is extremely small and scale-like. 



The telson (fig. 19) is rather narrow, and scarcely at all attenuated dis- 

 tally. It is cleft nearly to the base by a rather wide angular incision, and 

 has the lateral lobes conically tapered, and each provided at the tip with a 

 slender spine accompanied by a minute hair. Moreover, at some distance 

 from the tip exteriorly, a delicate bristle is affixed. 



Occurrence. — Of this form, solitary specimens were taken by Mr. War- 

 pa chowsky at Stat. 63 and 70, in the eastern part of the North Caspian 

 Sea. Another specimen is contained in tlie collection of Dr. Grimm, having 

 been taken in the southern part of the Caspian Sea, at Stat. 29, from a 

 depth of 28 fathoms. 



7. Gmelinopsis aurita, G. 0. Sars, n. sp. 



(PL 3, figs. 20—28). 



Specific Characters. — Cephalon with the lateral prominences greatly 

 produced, spiniform. Lateral tubercles of mesosome less prominent than in 

 the preceding species. The last 2 segments of mesosome, an^ those of meta- 

 some elevated to well-marked himellar expansions, the last one rounded, 

 the others triangular. Coxal plates about as in G. tuberculata, though some- 

 what less eep. The 2 posterior pairs of epimeral plates of metasome nearly 

 rectangulai. Urosome with small hairs dorsally, and a very minute denticle 

 on each side of last segment. Eyes oblong oval. Superior antenna; not nearly 

 twice as long as the inferior, flagellum scarcely attaining the length of the 

 peduncle. Gnathopoda less unequal than in G. tuberculata. Pereiopoda and 

 uropoda nearly as in that species. Telson, however, rather different, tri- 



•tas.-MaT. CTp. 267. I 7 30 



