Land and Freshwater Mollusca. 95 



Tromsø, consists of m i c a-s chi s t and grey limestone. The in- 

 vestigated parts of Tromsøen are mostly covered with gla- 

 cial sand, gravel and pebbles." 



Joachim Frieles work „Norges Laud og Fcrskvands 

 Mollusker", I have had to leave out of consideration, as, al- 

 though the author mentions species „which are to be found 

 over the whole country," he fails to specify any locality or 

 give any proofs of their really having been found. 



Professor G. 0. Sars has in his „Mollusca regionis arc- 

 ticæ Norvegiæ, 1878." 



Margaritana margaritifera L. 

 Limncea peregra Müll. 

 Sucdnea putris L. 

 Hyalina hammonis Strøm 

 Arionta arbustorum L. 

 The Mrg. margaritifera and L. peregra, are taken from 

 Friele, and should be excluded had not subsequent research 

 proved their existence. Sue. putris is said by Westerlund to 

 have been found in var. trianfracta, by Zetterstedt at Alten 

 in West-Finmarken. Sars has admitted Hyal. hammonis from 

 Westerlunds „Fauna Sveciæ, Norvegiæ," where he speaks of 

 a Hyalina from Finmarken in the museum of Upsala, and 

 which he considered to be this species ; I find however (Prof. 

 Lilljeborg having with his accustomed kindness sent me the 

 shell for examination) that E. v. Martens's supposition is cor- 

 rect ; it is not Hyal. hammonis but Hyal. petronella Chrp. 



In „Bidrag til Norges Land og Ferskvands Moll.", 

 Nyt Mag. f. Naturv. 1879, I have given the following five 

 species, of which the two first mentioned, were known from 

 other localities, 



Arionta arbustorum 

 Hyalina petronella 

 Conulus fulvus 

 Cochlicopa lubrica 



