MOLLUSCA OF LOWER CANADA. 101 



in the St. Lawrence at Montreal ; and probably widely diffused 

 throughout the province. 



Sphoerium solidulum, Prime. Creek at L'Orignal : R. B„ 

 It will probably be detected in Canada East, as it has been taken 

 so near the border. 



Sphoerium striatinum, Lamarck. (Cyclas edentula, Say.) Lachine 

 Canal, near Montreal : R. J. F. St. Lawrence and St. Charles rivers 

 near Quebec, abundant : J. F. W. 



Sphoerium rhomboideum,Saj, (sp.). Gregarious, but very local. 

 Old quarries near the Mile-end toll-gate, Montreal, but appa- 

 rently confined to a very limited space there. R. J. F., and J. F. W. 



Sphoerium occidental, Prime. Swamps on an island near 

 Lachine : R. J. F. 



Sphoerium transversum, Say, (sp.). Lachine Canal near 

 Montreal : R. J. F. St Lawrence near Quebec : J. F. W. 



Sphoerium securis, Prime. Old stone quarries filled with water, 

 near the Mile-end toll-gate, Montreal : R. J. F. and J. F. "W. 

 Lachine : R. J. F. 



Pisidium Virginicum, Brongniart. (Cyclas dubia, Say.) St. 

 Lawrence and St. Charles rivers at Quebec : J. F. W. Montreal, 

 in the St. Lawrence, and the Lachine canal. Probably common 

 in all the large tributaries of the St. Lawrence. 



Pisidium altile, xinthony. Fine in the ponds near the Mile- 

 end, Montreal : R. J. F., and J. F. W. A smaller, more compressed 

 variety abounds in the St. Charles River near Quebec ; J. F. W. 

 It is the P. compressum of Prime ; but Mr Anthony's name seems 

 to have priority. 



Pisidium abditum, Haldeman. A very common species in 

 Lower Canada. I cite four localities where I have taken it, as exam, 

 pies. Swamps in woods near the St. Charles river, Quebec : 

 trenches in fields near the Beauport road : marshy ground on the 

 Plains of Abraham, — both near Quebec. Brook near river St, 

 Pierre, Montreal. 



GASTEROPODA,— PECTINIBRANCHIATA. 



VIVIPAItnXE. 



Paludina decisa, Say. Common throughout the district. Rever- 

 sed varieties occasionally occur in the St. Lawrence, about 

 Montreal. 



