il8 ESMARK : MOLLUSCA OF NORWAY. 



found on the ' Frognerdam,' in Christiania, 1834. I have 

 compared them with those I have collected fifty years 

 later, they are just as thick and strong, but the form is not 

 quite the same ; the last whorl has been less convex, some- 

 what truncate, with very distinct sculpture, as in L. stag- 

 nalis, even in very young specimens. Alt. 16 to 17 mill. 

 Shells from Asker and Jarlsberg have the same form. 

 From Gaaso, in Nordland, I have a very interesting form 

 with the whorls very convex and suture very deep. Mala- 

 kozool Blatter, N. F., Band viii., with two plates. 



L. peregra var. margaritana. Asker. 



L. peregra var. ambigua West. Is an intermediate link 

 between peregra and lagotis. Prof. Sars has found some 

 in ' Lusvand,' at Jsedderen, which must be like this. It is 

 exceedingly pretty, glossy, very finely striated, yellowish- 

 brown, with dark reddish-brown spire. Alt. 17 mill, diam. 

 9 mill, mouth alt. ii"5 mill, diam. 6-5 mill. 



L. peregra var minor Mh. Alt. 9'ii mill, diam. 6'5 mill., 

 mouth alt. 7 mill., diam. 4*2 mill. Modum, in Christiania 

 Stift. 



L. peregra var. elongata Cles. Baadntjern, near Christiania. 



L. peregra var. peregra-ovata Kob. Salangen, in the Amt 

 of Tromso ; Kistrand in Porsangerfjord, in the Amt of 

 Finmarken. 



L. glabra Miill. Not very common. In the vicinity of 

 Christiania, Romerike, Laurvik, Jarlsberg, and Sandefjord, 

 in Christiania Stift ; Skudesnaes and Lillesand, in Christian- 

 sand Stift. 



L. glabra var. elongata Jeff* Bamble, near Langesund. 



L. glabra var. subulata Kob. In a pond at Arendal. 



L. truncatula Miill. Very common, both in the northern and 

 the southern parts. Porsangerfjord and SouthVaranger, 

 in the Amt of Finmarken. 



J.C, v., Oct., I8S6. 



