CRUSTACEA CASPIA. 357 



The antennae, as in tliajt species, are comparatively short and equal- 

 sized, scarcely exceeding iu length V4 of the body. The superior ones (fig. 12) 

 have the 1st joinf of the peduncle very large, nearly twice as long as the 

 other 2 combined. The llagellum somewhat exceeds the peduncle in length, 

 and is composed of about 1 1 articulations. The accessory appendage is com- 

 paratively more fully developed than in G. compressus, and composed of 4 

 to 5 articulations. The inferior antennse have the outer joints of the peduncle 

 rather richly supplied with bristles. The flagellum nearly attains the length 

 of the peduncle, and is composed of about 7 articulations. 



Tlie gnathopoda (figs. 13, 14) resemble those in G. compressus. though 

 the posterior ones are perhaps still more slender than in that species. 



[; The pereiopoda (figs. 15 — 18) also exhibit a very similar structure to 

 that in the above-named species, and need not therefore be described in detail. 

 In the last pair (fig. 18), however, the basal joint is comparatively larger and 

 more expanded, being nearly as broad as it is long. 



The last pair of uropoda (fig. 18) are rather elongated, about equalling 

 the urosome in length, and differ very markedly iu their structure from 

 those in G. compressus. Thus the inner ramus is much smaller, being scarce- 

 ly Vg as long as the outer, and the] terminal joint of the latter is likewise 

 very minute, as compared with that in the said species. The proximal joint 

 of the latter ramus is, on the other hand, much elongated and of a linear 

 form, with several slender setse on the inner edge and 2 or 3 small fascicles 

 of spines on the outer. 



The telson (fig. 20) is comparatively shorter than in G. compressus, 

 being not nearly so long as it is broad at the base; otherwise it exhibits a 

 very similar structure. 



The adult male is about same size as the female, and does not greatly 

 differ from it in outward appearance. It is, however, easily recognized by the 

 somewhat more strongly built gnathopoda. As in most other Gammari, the 

 posterior pair (fig. 22) are more powerful than the anterior (fig. 21), the 

 propodos being in the former considerably larger and broader. In both pairs 

 the palm is somewhat oblique, and armed iu the middle, outside, with a 

 strong spine in addition to those occurring on the lower corner. 



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

 in 6 different Stations of the North Caspian Sea. Of these, one (St. 16) is 

 located off the island Swjatoj; another (St. 21) at the northern point of the 

 peninsula Mangyschlack, 2 others (St. 53, 54) at some distance north of 

 the islands Kulaly and Morskoj, the last 2 (St. 61, 63) in the northern and 

 eastern part of that Sea. 



In the collection of Dr. Grimm, several specimens of this species are 



$Q3.-MaT. cxp. 337. 15 



