ESMARK : MOLLUSCA OF NORWAY. I07 



Subgenus CHILOTREMA Leach. 



Chilotrema lapicida L. Probably very common both in 

 Christiania and Christiansand Stifts, but nowhere abundant. 

 In the vicinity of Christiania, Asker, Lier, Modum, Ringe- 

 rige, and Sandefjord in Christiania Stift ; Langesund, 

 Skien, Telemarken, and Lillesand in Christiansand Stift ; 

 Sognefjorden in Bergen Stift. 



C. lapicida var. minor. Bamble near Langesund, diam. 

 i3"5 mill., alt. 6 mill. Asker near Christiania, diam. 

 1 3 '5 mill, alt. 4*5 mill. 



Subgenus ARIONTA Leach. 

 Arionta arbustorum L. Very common; is found in all 

 parts of the country, as well on the highest mountains as 

 up in the far north. The shells are very thin everywhere 

 in the north, as also in the south, where the soil is very 

 poor in lime ; in the park at Jarlsberg, where they live in 

 great quantities, they are very thin and mostly semi-trans- 

 parent. Groto in the Amt of Nordland ; Maalselven, 

 Tromsoen, Reno, and Fugled in the Amt of Tromsd ; 

 Porsangerfjord in the Amt of Finmarken. 



A. arbustorum var. rudis Miihlf. Found at Fredriksvcern 

 and Dovre (1000 metres). Clessin, in a letter to me, said 

 that he very much doubted that this variety was to be 

 found here, as it has previously only been found in the 

 south of Tyrol. Dr. Poulsen, of Copenhagen, was kind 

 enough to lend me the two specimens he found at Fred- 

 riksvaern, and they are quite identical with some examples 

 I have from Prof. E. von Martens, at Berlin, which he 

 found in Tyrol. Therefore there can be no doubt that 

 the specimens found at Dovre are the var. rudis. 



A. arbustorum var. alpestris. With both high spire and 

 depressed. ' Skeikampen ' in Gansdal, Gudbransdalen, 

 and Lofoten in the Amt of Nordland. 



