i gob] Fresh-water Shells from N. W. Ontario, &c. 31 



Gasteropoda. 



Valvata tricurinata, Say. 



Albany River, four specimens. 



Valvata stncera, Say. 



Lake St. Joseph, at two localities ; four specimens." 



Amnicola limosa, Say. 



Root River, several specimens. 



Limncea stagnalis, L. 



Trout Lake, Severn River, Keewatin ; two specimens. 



Limncea catascopium, Say. 



Albany River, six specimens ; and Trout Lake, two speci- 

 mens. 



Planorbis ( Helisoma) bicarinatus, Say. 

 Albany River, one specimen. 



Planorbis ( Gyraulus) albus, Muller. 



Albany River, four specimens ; and West Branch of the 

 Winisk River, seven specimens. 



Physa hcterostropha, Say. 



Albany River, three specimens. 





Ancylus parallelus, Haldeman. 

 Root River, one specimen. 



(C) Prom Knee Lake, Keewatin, on the Hayes River 

 route from Norway House to York Factory, in Lat. 

 ,-5 N., and Long. 95 W. ; collected by O. O' Sullivan, 

 of the Geological Survey of Canada, in igo$. 



Pelecypoda. 



Sphcerium simile (Say); 



One adult and perfect specimen. 



*Spluvrium emarginatum (?) Prime. 

 (Or 6*. stamineum, Conrad, var.) 

 Several specimens. 



