ÖFVERSIGT AF K. VETENSK.-AKAD. FÖRHANDLINGAR 1900, N:0 1. 17 



show that in spite of its name it not only inhabits the great 

 depths. 



2^5 outside the harbour of Baku, not far from the island 

 Nargin, depth 11 — 14 m. Härd bottom consisting of shells. 

 Cardium, Dreyssena and Neritina some few Astacus leptodactylus 

 and several small crustacea. Larvge of Chironomiis. 



The list of invertebrate animals contained in my dredgings 

 chiefly includes Crustacea and Mollusca. 



Crustacea. 



The largest representative of this class is the crayfish 



Astaeus leptodactylus Eschscholtz. 



This animal seems to be distributed över the whole of the 

 Caspian Sea, as 1 obtained it at the islands Kulali, Svjätoj and 

 Dolgoi ofF the Transcaspian coast, at Baku and bought it from 

 Krasnovodsk. The specimens were light coloured, nearly whitish 

 with small round pigmented spöts on the upper parts. The 

 colour of the said pigmented spöts was very difFerent in difFerent 

 specimens, dark green, olivaceous, reddish brown, almost violaceous 

 etc. The legs often had a light greenish tint. I could not see 

 any difference between the specimens caught in the Caspian Sea 

 and those from a fresh water lake Adshi-Kabul in Transcaucasia. 



Astacus pachypus Rathke 



I failed to catch. It seeras to be scarce. 



Professor G. O. Särs has been kind enough to determine 

 my collections as far as they contained Schizopoda, Cumacea 

 and Amphipoda and thanks to his valuable assistance I am able 

 to givs the following list with notes on the habitat of the difFerent 

 forms. With regard to the morphology of these forms I refer 

 to the extensive works of Professor G. O. Sars on Crustacea. 



Öfvers. af K. Vet.-Akad. Förh. 1900. Arg. 57. N:o 1. 2 



