THE NAUTILUS. 



VOL. XIII. MAY, 1899. No. 1. 



A LIST OF THE LAND AND FRESH-WATER SHELLS OF MANITOBA. 



BY A. W. HAN1IAM, WINNIPEG, MAN. 



When I commenced collecting here in 1894, my enthusiasm was 

 soon checked by the dearth of land shells, in which, since I first col- 

 lected, I have been particularly interested. In fresh- water species 

 things were different, as this list shows, but I have never felt the 

 same interest in them, and my work here, as far as they are con- 

 cerned, lias been half-hearted, and I have done nothing at all during 

 the past two seasons. Under these circumstances, I have thought it 

 advisable to publish this list before my records get lost or destroyed. 

 The most striking feature here (even after Quebec) was the utter 

 absence of all the larger species of land shells (with the exception of 

 the Succineas), and the scarcity of even the small kinds which have 

 been taken. However, I am still impressed with the idea that some 

 few of the larger species may occur, rarely perhaps, in the well- 

 wooded districts lying in the extreme east, southeast and northeast 

 of the Province. The country I have worked here has been mostly 

 prairie, even though swampy or wooded in places, and really almost 

 the only localities worth exploring are the river " bottoms." Water 

 shells, especially by contrast, are quite conspicuous; the sand dredged 

 from the Red river for building purposes contains a mass of Sphreria, 

 and along the river banks the large valves of Uniones are very notice- 

 able. The raihvay ditches and sluices, which are generally dry early 

 in the summer, have in their bottoms a mass of Limnrea, Aplexa and 



