CRUSTACEA CASPIA. 301 



Tlie inferior antenua) (figs. 4 and 7) are in botli sexes very strongly 

 built, thouglij'^as usual, much larger iu the male than in the female, equal- 

 ling in the former % of the length of the body. The penultimate joint of the 

 peduncle is exceedingly large and tumid, and is produced at tlie end pos- 

 terioi'ly to a very prominent, thumb - like projection terminating in an 

 acuminate point, and having inside a well marked secondary tooth. Tliis 

 projection is comparatively more strongly developed in the male than in the 

 female (comp. figs. 4 and 7), but iu both sexes extend until the end of the 

 last peduncular joint. The latter exliibits the usual- cylindnc shape, and is 

 scarcely more than half as long as tlie penultimate joint. It has inside, some- 

 what below the middle, a short and stout recurved prominence, and is more- 

 over produced at the end to a strong spiniform process. WJien the joint is 

 bent in, tliis process crosses the tip of the thumb-like projection of the pre- 

 ceding joint, whereby the antenna acquires a pronounced clieliform character 

 (see fig. 17). The flagellum is about the length of the last peduncular joint, 

 and of same structure as in the preceding species. 



The gnathopoda (figs. 8 — 9) agree nearly exactly iu their structure with 

 tliose in the said species, and need not therefore be described in detail. 



The 2 anterior pairs of pereiopoda (fig. 10) appear somewhat more 

 strongly built, though they are rather elongated. The meral joint is somewhat 

 longer than the last 2 combined, and gradually expands distally, terminat- 

 ing in front in an obtuse, setiferous prominence. The anterior edge of this 

 joint is in both sexes nearly quite smooth. The carpal joint is ratlier short, 

 and the propodal one less slender than in G. nohile. Tlie dactylus is not fully 

 so long as the propodal joint, and very acute. 



The 2 succeeding pairs of pereiopoda (figs. 11, 12) do not exhibit any 

 essential difference from those in the preceding species. 



The last pair of pereiopoda (fig. 13) are likewise of a very similar 

 structure, though being perhaps not quite so slender as in C. nohile. Of the 

 outer joints, the propodal one is particularly elongated, being nearly twice as 

 long as the carpal one. 



The uropoda (see fig. 14) agree on the whole with those in the preced- 

 ing species, except that the rami of the 2 anterior pairs are spinous only at 

 the tip and the outer edge. 



The telson (ibid.) would likewise seem to be constructed in the same 

 manner as in that species. 



Also the pigmentation of the body resembles that observed in G. nohile. 



Occurrence. — This species has been collected by Mr. Warpachowsky 

 at no less than 1 different Stations of the North Caspian Sea. Of the Stations 

 one (St. G) is located near the western coast, at the entrance of the Bai Agra- 



»a3.-MaT. cip. 209. 27 21 



