T. Xin] • CRUSTACEA CASPIA. 479 



The telson (ibid.) exhibits the same transversally quadrangular form as 

 in the 2 preceding species. 



Colour. — The specimens of this form also exhibited traces of the origi- 

 nal colouring in a number of reddish brown, stellate pigmentary spots, the 

 arrangement of which is shown in figures 1 and 2. 



Occurrence. — A few specimens of this form were collected by Mr. 

 Warpachowsky at Stat. 53 and 63, the former located at some distance 

 north of the islands of Kulaly and Morskoj, the latter in the eastern part 

 of the North Caspian Sea, south of the mouth of the Ural. Another specimen 

 of the same species was contained in a small collection of Caspian Crustacea 

 sent me from the Zoological Museum in St. Petersburgh, and was, accord- 

 ing to the label, taken by the late academician Baer off the peninsula 

 Mangyschlak. 



4. Pseudocuma cercaroides, G. 0. Sars, n. sp. 

 (PI. V and VI). 



Specific Characteristics. — Body short and stout, with rather strongly in- 

 crusted integuments, and having the anterior division in female rather tumid 

 and ovoid in form, in male, as usual, considerably narrower. Carapace com- 

 paratively large and deep, with the branchial regions very sharply defined 

 in front, but without any lateral folds; pseudo-rostral projection rather pro- 

 minent, horizontal and terminating in an obtusely acuminate point; antero- 

 lateral corners in female very slight, in male somewhat more projecting and 

 nearly rectangular. Exposed part of trunk strongly vaulted above, especially 

 in female, but without any keel or projections. Metasome scarcely longer 

 than the anterior division of the body. Eye rather fully developed, especially 

 in the male, with all 3 cornese distinct. Legs of comparatively robust struc- 

 ture. Uropoda rather short, with the rami very unequal, the inner one being 

 considerably larger than the outer, and having the inner edge spinulose. 

 Telson very small, nearly semicircular in form. Length of adult female 

 5 mm, of male about the same. 



Remarks. — In its outer appearance this species somewhat resembles 

 the typical form P. cercaria, and its specific denomination refers to this 

 resemblance. It is, however, much more strongly built, and has the pseudo- 

 rostral projection considerably more prominent. Moreover, in the carapace, 

 the oblique folds, which characterize both that species and the Mediterra- 

 nean form, P. ciliata, are entirely wanting. 



Bulletin N. S. JV (XXXVI) p. 315. 34* 



