ESMARK : MOLLUSCA OF NORWAY. 1 1 3 



C. bidentata var. subrugosa West. Modum. 



C. bidentata var. minor. Alt. 7-5 — 8 mill. Christiania 



and Fredikshald, 

 C. bidentata var. elongata Cles. Brevik and Modum. 



Family SUCCINID^. 



Genus SUCCINEA Drap. 



Subgenus NERITOSTOMA Klein. 



Succinea putris L. Very common in Christiania and 

 Christiansand Stifts, Bergen (H. Friele) ; but it is not yet 

 found higher up than 61°. Slender forms are most com- 

 mon, measuring alt. 20 mill, diam. 11 "5 mill., mouth alt. 

 i4"5 mill., diam. 77 mill. The colour is variable — grey 

 and greyish-yellow at Christiania, smoke-colour at Modum 

 and Fredrikshald, yellow to brown from Jarlsberg, whitish- 

 yellow to reddish-brown from Eker. 



S. putris var. olivula Baudon. Jarlsberg, Hole, and Mjon- 

 dalen in Christiania Stift. 



S. putris var. trianfacta Da Costa. Laurvik and Skien. 



S. putris var. limnoidea Pic. Fragnerdamraen near Chris- 

 tiania ; one shell collected 1834. 



Subgenus AMPHIBINA Morch. 



S. stagnalis Gassies. Colour: greyish-yellow. Some speci- 

 mens found in 1870, near Arendal, by O. Jensen. 



S. pfeifFeri Rossm. Much more common than S. putris. 

 In the vicinity of Christiania, Skiensfjord, Lillesand, 

 Arendal, Bergen, Nordland, Tromsoen, Maalselven, in 

 the Amt of Tromso; Alten, Pasvikelven, in South-Varanger. 

 The colour is in the south pale greyish-yellow or smoke- 

 coloured, but in the north amber-coloured. 



S. pfeiflPeri var. contorta West. Tromsoen. 



S. pfeifferi var. propinqua Baudon. Arendal. FromTdnset 

 I have one shell which very much resembles this variety ; 

 it is smaller, very glossy, brownish-smoke colour, with red 

 spire. 



S. pfeifferi var. ventricosa Pic. Gaaso, in the Amt of 

 Nordland. 



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