ÖFVERSIGT AF K. VETENSK.-AKAD. FÖRHANDLINGAR 1900, N:0 1. 23 



Ostracoda are as yet not known from the Caspian Sea, but 

 I collected several specimens of this group which will be described 

 låter on by Mr. J. Gunnar Andersson. In the collections are at 

 least 3 species of Cythere and 1 species of Cytheridea and Loxo- 

 conclia resp. 



Mollusca. 



The following Gastropoda are named by using for Classifi- 

 cation Dybovski's paper »Die Gastropoden fauna des Kaspischen 

 Meeres», ') but I do not enter upon discussipg the validity of the 

 different species, the less so as only few species are included in 

 my collection. 



Micromelania caspia (Eichwald) Dybovski. 

 (Stat. 9 and at Baku.) 



Only a shell was found at Stat. 9, several at Baku. Accord- 

 ing to Grimm the adult specimens live in greater depth. 



Micromelania spica (Eichwald) Dybovski. 



(Stat. 2, 6, 9, 11 and 12.) 



Depth: 19 feet — 8 sashen. This form seeras to prefer rather 

 härd and clean, not muddy bottom, where it lives among shells. 

 In two instances the bottom was at least partly covered with 

 algse and twice the bottom was mixed shells and clay. Grimm 

 regards 7 sashen as the minimum depth for this form, but as it 

 seems, it lives in still shallower water. This discordance may be 

 due to the difFerent time of investigation. It is rather common 

 in the North Caspian Sea. . 



Clessinia variabilis (Eichwald) Dybovski. 



(Stat. 11 and 12). 



Depth: 24 — 30 feet among algae and shells. At Baku I 

 found two small shells which I suppose were young specimens 

 of this species. 



') Malacozoologische Blätter, herausgegeben von Clessin, neue Folge, Bd. 10, 

 Cassel 1888. 



