T. XIIl] - CRUSTACEA CASPIA. 485 



of the 2nd pair (tig. 1 3) is armed at the tip with small recurved hooks, 

 3 in number. 



The 2 pairs of pleupocla (figs. 15 and 16) do not differ in their structure 

 from those in the males of the other species of the genus. 



The uropoda (fig. 1 7) have the rami somewhat more elongated than in 

 the female, and the inner ramus moreover differs in its inner edge being 

 finely ciliated between the marginal spines, which are 9 in number. The 

 telson exhibits a form similar to that in the female. 



Colour. — All the specimens which I have examined, were of a uniform 

 whitish colour, without any trace of pigmentary ornament. 



Occurrence. — Numerous specimens of this form were collected by Mr. 

 Warpachowsky at Stat. 2 in the western part of the North Caspian Sea, 

 south of the Tschistyi-Bank. 



The same species also occurred occasionally in 4 other Stations, 2 of 

 which (48 and 50) likewise belonged to the western part of the North Cas- 

 pian Sea, whereas the other 2 (49 and 51) were located between the islands 

 of Kulaly and Morskoj, north of the peninsula Mangyschlak. 



6. Pseudocuma graciloides, G. 0. Sars, n. sp. 

 (PL VIII). 



Specific Characteristics. — Very like the last described species, but compa- 

 ratively more strongly built, the anterior division being oblong oval in form 

 and somewhat vaulted above. Carapace comparatively larger, exceeding in 

 length the exposed part of the trunk, and having the branchial regions more 

 distinctly defined; pseudo-rostral projection rather prominent and acuminate; 

 antero-lateral corners obtusangular. Metasome rather slender, exceeding in 

 length the anterior division of the body. Eye well developed and very large 

 in the male. Antennae, oral parts and legs nearly as in P. gracilis. Uropoda 

 rather slender and elongated, with the rami equal-sized and much attenuated, 

 the inner one in female armed inside with a row of 6 comparatively very 

 small spinules, the outer one having only a single spinule on the inner edge 

 near the tip. Telson small, semi-elliptical. Length of adult female 6 mm., of 

 male about the same. 



Bemarks. — As indicated by the specific name, this form is very nearly 

 allied to P. gracilis, with which it may easily be confounded. On a closer 

 examination, it is however distinguished by a somewhat less slender form of 

 the body, and by the comparatively larger size of the carapace, the pseudo- 

 rostral projection of which is also more prominent and acute. 



Bulletin N. S. IV (XXXVI) p. 321. 



