ESMARK : MOLLUSCA OF NORWAY. II5 



alt. 37"5 mill., diam. i6 mill., mouth alt. 20 mill., diam. io'5 mill. 



The two last have very slender spires, and the outer- 

 lip of the mouth reflected ; the whorls are convex, except 

 one shell, which is a little concave, as Clessin mentions in 

 his ' Excursions Fauna ' for var. subulata West. In 

 * Aborretjern' in Gudbransdalen, a great quantity of them 

 are living. The lake is very small, and they seem to live 

 under very homogenous conditions, but in spite of this they 

 are developed into more than ten different forms, from one 

 very near var. colpodia, but with slender spire, and other 

 shells gradually more slender, some with very long and 

 slender spires, the last whorl more convex, and the outer-lip 

 of the mouth reflected ; they remind me of var. ampliata 

 and No. 1234 in Rossmassler's Iconographie, which Kobelt 

 considers to be the real var. fragilis ; some have the last 

 whorl less convex and somewhat angled at the upper part. 

 Var. minor, with narrow whorls, is also represented. The 

 dimensions are given for the greatest and smallest shell. 



alt. 46 mill., diam. 21 mill., mouth alt. 25 mill., diam. 14-5 mill. 

 „ 34 ,y 33 i4"5 33 33 i7'5 33 33 9'5 33 



3, 31 33 3, i3'5 33 33 16 „ „ 8-5 „ 



From Norderhoug, in the Ringerige I have some 

 handsome and very slender shells, alt. 37-3 mill, .diam. 14-5 

 mill., mouth alt. 17-5 mill, diam. 8.5 mill. 



L. stagnalis var. turgida Menke. Tonset in Hamar Stift. 



L. stagnalis var. minor Kob. Tonset, Abborretjern, 

 Gudbransdalen. 



Subgenus GULNARIA Leach. 

 .Gulnaria auricularia L. Rare. Tyrifjorden and Asker in 

 CEstenso near Christiania. Prof Sars found them in great 

 quantities ; lately they have quite disappeared. Lier, Skien. 



