Land and Freshwater Mollusca. 97 



Several of the species are found far north; B. per- 

 versa has been found on Hammerø (68'' 15' N.) by Mrs. 

 Gylche. That Fat. pygmæa is found at Vardø (70'^ 20' 

 N) is of very great interest, as showing how very far to the 

 north Mollusca are distributed along our coasts where the 

 temperature never sinks so law as in the interior of the coun- 

 try. Westerlund (Sibir. Land ock Ferskv. Moll.) mentions — 

 according to G. Gerstfeldt — Kultuk at the lake of Baikal 

 as the most northern locality in Siberia for P. pygmæa 

 and Luleå Lapmark in Sweden. 



Clausilia bidentata lives even on Tromsøen, where Pupa 

 alpestris also is to be found. 



L. truncatula is very common on Tromsøen, espe- 

 cially in slender forms. 



All the information concerning the habitation of the 

 Mollusca I owe to Mr. Schneider, as I have not personally 

 made any of these collections. 



Arion Fér. 



A. empiricorum Fér. 



var. albus. A young specimen from Tromsdalen. 



A. subfuscus Drp. Common on Tromsøen. The co- 

 lour of specimens from the museum of Tromsø is very dark 

 brown, and goes in one case evenly over into the side — 

 bands, while in another these are well defined. A very large 

 specimen is from Andenæs on Andø. Miss Møller has brought 

 me two specimens from Stangenæs at the mouth of Tana 

 river, which are of a light brown colour on the back. 

 Limax Lister. 



L. agrestis L. Very common on Tromsøen ; Mr. Schnei- 

 der has found it to the middle of October ; but scarcely any 

 of the specimens found exceed 25 m. m. in length. The 

 colour is uniform light brown, 



t 



