II 6 esmark: mollusca of Norway. 



G. lagotis Schr, More common than the preceding species. 

 Asker, with the whorls very convex, and open umbilicus ; 

 Ringerige, Skien, Christiania, Dovre (looo m. high) ; 

 Fiskumvand at Eker ; Lillehammer, very thin and brittle ; 

 Manger, near Bergen ; and Tonset. 

 G. lagotis var. baltica Nilss. Arendal. 



G. ovata Drap. Probably all over the country, as it is very 

 common in Christiania, Christiansand, Hamar, and Tromso 

 Stifts. From most localities, very thin and so changeable 

 in form, that I hardly have the same form from two localities. 

 All these variations and transitions make it very difficult 

 and doubtful how to deal with varieties, which very often 

 seem to be ' Bedingte varietdten.^ On that account I have 

 found it better to wait, in hopes that when we have got 

 many more collections from different parts of the country, 

 and from the same locality more than one year, we shall be 

 able to give a fuller account of this species. In a rivulet in 

 Asker, where there is a rapid current, I collected many 

 shells, both full-grown and young ones, the latter with the 

 spire very slender, whorls very convex, mouth broad (egg- 

 formed), reminding me of lagotis. The full-grown speci- 

 mens had the spire shorter, mouth larger, and resembling 

 V2Ci.' patula D. C. In Tonset Gulnaria lives in every lake 

 and pond, but nowhere in its typical form. In a swamp 

 overgrown with rushes, there lived a very interesting form, 

 which reminds one equally of lagotis zn6._peregra as ovata. 

 I had the opportunity to collect them in two succeeding 

 summers, they are not only different the two years but also 

 each collection. All have the first whorls very convex as 

 lagotis, but the spire is more plump and the suture not so 

 deep, more like ovata. The last whorl is depressed 

 under the suture, which makes it angled, not rounded, in 

 bending down. The first year's collection was for the 

 greater part full-grown specimens. Some had the last 

 whorl compressed under the suture, this makes it less 



J.C, v., Oct., 18S6. 



