112 ESMARK: MOLLUSCA of NORWAY. 



Genus BALEA Prid. 

 Balea perversa L. Not very common. Christiania, Skien, 

 Langesund, Brevik, Lillesand, Bergen, Dovre 600 m. high, 

 Throndhjem, Trano, and Groto in the Amt of Nordland. 



B. perversa var. lucifuga Leach. Fredriseshald in Christiania 



Stift. 



Genus CLAUSILIA Drap. 

 Subgenus CLAUSILIASTRA Moll. 

 Clausilia laminata Mont. Very common in Christiania and 

 Christiansand Stifts. 



C. laminata var. virescens Ad. Schm. Jarlsberg. 

 C. laminata van nana. Laurvik and Christiania. 



Subgenus ALINDA Bottg. 

 C. biplicata Mtg. Manger, near Bergen. 



Subgenus PYROSTOMA Vest. 

 C. ventricosa Drap. Very rare. Brevik. 

 C. rol phi Leach. Very rare. Christiania and Asker. 

 C. plicatula Drap. Common round Christiania, Modum, 



Jarlsberg, Langesund, and Slden. 

 C. plicatula var. leucostoma West. Modum and Drammen. 

 C. plicatula var. curta Ad. Schm. Asker near Christiania. 



Subgenus IPHIGENIA Gray. 

 C. sejuncta West. Rare. Ekeberg near Christiania, and 



Langesund. 

 C. dubia Drap. var. obsoleta A. Schm. Rare. Asker, 



Bergen, and between Skien and Porsgrund. 

 C. cruciata Stud. Gausdal in Hamar Stift. 

 C. bidentata Strom. The most common of all our Clausiliae. 



Found everywhere in the southern parts ; much less 



frequent in the north, where it is found as high as Reno in 



the Amt of Tromso. It has seldom folds on the inter- 



lamellare. 

 C. bidentata var. septentrional is A. Schm. Often with 



the type. 

 C. bidentata var. exigua West. Modum. 

 C. bidentata var. erronea West. Brevik. 



J.C, v., Oct., 1886. 



