ESMARK : MOLLUSCA OF NORWAY. 



125 



A. cygnea var. cellensis Gmel. Asker, Trdgstad, Vandso, 



near Moss ; and Hvalderne, in Christiania Stift, 

 A. cygnea var. ponderosa Pfr. Borseso, near Skien. 

 A. cygnea var. anatina L. Trdgstad. 



TABLE OF DISTRIBUTION-* 



* I have divided Norway in two parts — south and north of the polar- 



circle.^ 



