172 JOURNAL- OF CONCIIOLOGY, VOL. 12, NO. 7, JULY, I908. 



in length, communicating with the sea by a river a mile and a half 

 long. Quays and warehouses line the sides of the river around which 

 the town is built. There are also many swamps and a canal. Con- 

 trary to my expectations the sandhills yielded absolutely nothing. The 

 following species were found along the canal banks and around the 

 lake in the usual situations. I found nothing in the ancient forests 

 surrounding the lake, but as the trees were birches, oaks or firs, this 

 did not surprise me. 



Arion circumscriptus Johnston. — One pale blue specimen with 

 darker bands. 



Agriolimax agrestis Linn. — Type common. Under a pile of 

 bricks I found a small colony of individuals with jet-black marbling 

 thickly covering a normal body colour. 



Hyalinia nitida Miill. — One specimen on the lake shore. 



Hy. radiatula Aid. — Three, under logs. 



Helix hispida var. hispidosa Mouss. — One pale specimen. 



Cochlicopa lubrica and var. lubricoides Fer. — Common. 



Vallonia pulchella Miill. — Moderately common. 



Pupa muscorum Linn. — Common. 



Succinea putris Linn. — Common. 



S. elegans var. pfeifFeri Rossm. — One specimen. 



Planorbis corneus Linn. — Two specimens. 



PI. umbilicatus Miill— Common. 



PL spirorbis Miill. — Moderately common. 



Limnasa palustris Miill. — Very abundant; in fact the commonest 

 shell in the district. 



L. peregra var. boissyi Dup. (major). — Mr. J. W. Taylor, to 

 whom I have submitted these shells, which are all of one form, says, 

 "The Limncea is a form of L. lagoiis; however, I shall prefer to 

 place it under the form of peregra, around which centre balthica, 

 boissyi, Sic." 



L. stagnalis Linn. — Common and typical. 



L. truncatula Miill. — One specimen. 



Bithynia tentaculata var. curta. — Only found in the lake, all 

 of the same stunted form. 



Neritina fluviatilis Linn. — Only a single juvenile specimen 

 found, which would be impossible to pronounce upon positively, but, 

 as Mr. E. A. Smith informs me that fluviatilis is the only Neritina 

 known around the Baltic, I think we may assume that the specimen 

 in question belongs to that species. 



I am indebted to Messrs. J. W. Taylor, E. A. Smith and R. Standen 

 for kindly identifying and confirming many species. 



