T. XIIl] CRUSTACEA CASPIA. 487 



The adult male (fig. 11) looks very like that of the last-named species, 

 but is somewhat less slender, with the anterior division of the body compa- 

 ratively thicker and more vaulted above. The sexual characteristics also, 

 are, on the whole, developed in a very similar manner, and need not there- 

 fore be treated in detail. The eye (see the figure on the left side) is very 

 large, and has the corneae strongly vaulted and highly refractive. The uropoda 

 (fig. 12) only differ from those of the female in the greater number (10) of 

 marginal spinules with which the inner ramus is armed, and in the finely 

 ciliated edge. 



Colour, — Unlike what was the case with the specimens of P. gracilis, 

 those of the present form exhibited an ornament of distinct, reddish brown, 

 stellate, pigmentary spots very similar to that stated in the 3 first described 

 species. 



Occurrence. — I have only had an opportunity of examining a few spe- 

 cimens of this form. They were collected by Mr. Warpachowsky at 3 dif- 

 ferent Stations, one of which (St. 51) was located between the islands of 

 Kulaly and Morskoj, the second (St. 53) at some distance North of these 

 islands, and the third (St. 63) in the eastern part of the north Caspian Sea, 

 south of the mouth of the Ural. 



7. Pseudocuma tenuicauda, G. 0. Sars, n. sp. 

 (PL IX). 



Specific Characteristics. — Body somewhat less elongated than in the 2 pre- 

 ceding species, with very thin and pellucid integuments. Anterior division of 

 the body sharply marked off from the posterior, and considerably exceeding 

 it in length, being oblong in form, and nearly of same height throughout. 

 Carapace in female scarcely longer than the exposed part of the trunk, and 

 having the branchial regions but faintly defined; pseudo-rostral projection 

 comparatively small, horizontal; antero-lateral corners obtusangular. Free 

 segments of mesosome rather deep, and quite smooth above, the 2 posterior 

 ones unusually massive, and filled on the sides with strong muscles. Meta- 

 some extremely narrow, cylindrical. Eye well developed. Antennae, oral parts 

 and gnathopoda scarcely differing from those in the 2 preceding species. The 

 2 anterior pairs of legs rather slender, and of the usual structure; the 3 

 posterior pairs unusually strongly built, with the propodal joint much shorter 

 than the carpal one, and oval in form. Uropoda moderately slender, and hav- 

 ing the scape fringed inside with ciliated setae, rami equal-sized, and about 

 the length of the scape, the inner one in female having only 3 marginal 

 spinules. Telson semi-elliptical in form. Length of adult female scarcely ex- 

 ceeding 3 J / 2 mm, that of male about the same. 



Bulletin N. S. IV (XXXVI) p. 323. 



