478 J- P- •'• Ravn. 



Pr. eduliformis Roem. sp. They seem to agree to a certain extent 

 with Roemer's description of his "Venus irapeziformis" , which is said 

 to he identical with the species mentioned, but nevertheless seem to 

 be somewhat more strongly inflated. Owing to the lack of material 

 for comparison I am not able to settle this question. 



At "4. Saenkning" on Store Koldewey Island 4 specimens of a 

 Protocardia were found, which may belong to the same species as 

 the above-described from "Kloft I*'. 



48. Cyprina cfr. mosquensis d'Ohbigny. 



PL XXXV, fig. 2. 



Some casts of a Cyprina greatly resemble casts which are pre- 

 served in the collections of the Mineralogies] Museum under the 

 name Cyprina mosquensis d'Orb. and which are stated to have been 

 found at Kharoschowo at Moscow. Unfortunately, I cannot find, 

 where this form is described. 



The cast evenly and comparatively slightly arched, rather oblique, 

 with pointed, projecting umbo, which inclines strongly forwards. 

 The angle at the umbo ca. 110°; the anterior margin grading evenly 

 into the ventral margin and this again into the posterior margin. 

 The hinge as usual in Cyprina with 3 cardinal teeth and 1 lateral 

 tooth in the ventral valve posteriorly. Muscular impressions and 

 pallial line not observed. 



Height 14 mm, breadth 18 mm and thickness 7 mm. 



The casts described differ from C. mosquensis especially in that 

 they are somewhat less arched; further, the umbo is more pointed 

 and inclined somewhat more forwards. Rut in the former character, 

 especially, the Russian species seems to vary considerably. 



Another cast from the same locality as the above greatly resembles 

 these, but has a somewhat longer anterior end and in consequence 

 a more median umbo and the ventral margin in a flatter curve. 

 It is doubtful, therefore, whether it can be referred to the same species. 



Distribution. North-East (ire en land: "Kloft I" on Store 

 Koldewey Island (3 — 4 specimens). 



Russia: the above-mentioned specimens of C. mosquensis are 

 stated to have been found at Kharoschowo in deposits belonging to 

 Malm fi. 



49. Cyprina kharoschovensis ROUILLIER. 



PL XXXV, fig. 4. 



1847—48, Cyprina kharoschovensis Rouii-likk, Etudes progr. Geol. Moscou. II. p. 421; 



PI. H, fig. S3. 



The shell rounded, triangular, rather flat. The umbo far in front 

 of the middle, bent strongly forwards. The anterior margin and the 



