24 LÖNNBERG THE BIOLOeY OF THE CASPIAN SEA. 



? Caspia grimmi Dybovski. 



(Stat. 3, 5, 6, 7 aud 9 as well as at Baku.) 

 Depth: 2 — 8 sashen; mixed bottom, shells and mud, seems 

 to be preferred by this species, which occurred oftener and in 

 larger number than other gastropods (except perhaps Neritina) 

 in my dredgings. I am not sure about the Classification of this 

 species, but the specimens I have collected agree best with 

 Dybovski's drawings (1. c.) of the species mentioned. 



Zagrabica brusiniana Dybovski. 



(Stat. 2, 6, 11 and 12 as well as at Baku). 



Of this form I have found only dead shells, but rather 

 commonly. Dr. V. Dybovski has been good enough to state the 

 correctness of this determination. It is a very interesting species 

 as its nearest allies are found in the Tertiary Congeria-Strata 

 of Slavonia. 



Neritina liturata EiCHWALD. 



(Stat. 2, 5, 7, 11 and 12 as well as at Baku.) 

 Depth: 2 — 8 sashen. This form with its numerous varieties 

 is very common in the Caspian Sea, chiefly on comparatively 

 härd bottom among shells and alg*. Its shell was often covered 

 with calcareous algse. 



Lamellil)ranchiata. 



Cardium edule LiN. 



(Stat. 2, 3, 7, 8 and 9 as well as at Baku,) 

 Depth: 13 feet — 8 sashen; as well on härd as on clayey 

 bottom. 



C. trigonoides Pallas. 



(Stat. 2, o, 7 and 11.) 



Depth: 13 feet — 8 sashen; chiefly on härd and clean bottom. 

 At stat. 3, on clay, only young individuals were collected. 



