MOLLUSCA 



Planorbis bicarinatus, Say (B), (L). Grenadier 

 Pond, Etobicoke Creek, Humber 

 Kiver. 



" trivolvis, Say. (B), (L). Grenadier 

 Pond, Centre Island. 



campanulatus, Say. (B). Grenadier 

 Pond. 



exacuous, Say. (B). Grenadier Pond, 

 Scarborough Bluffs. 



deflectus, Say.? (B). 



parvus, Say. (B). Grenadier Pond, Eto- 

 bicoke Creek, Scarborough Bluffs. 



crista, Linne. ? Grenadier Pond. 



Family Physidae. 

 Physa heterostropha, Say.? (B). 



" ancillaria, Say. Grenadier Pond, Don River, 



Etobicoke Creek, Humber River. 

 " integra, Haldeman. Don River, Etobicoke 



Creek. 

 Ancylus parallelus, Haldeman. Etobicoke Creek, 



Centre Island, Grenadier Pond, 

 tardus, Say. Grenadier Pond. 

 " rivularis, Say. Creek in North Toronto. 



Family Amnicolidae. 



Amnicola limosa, Say. (B). Grenadier Pond, Eto- 

 bicoke Creek> Centre Island, Don 

 River. 



" emarginata, Kiister. 

 Bythinia tentaculata, Linne. (L). 

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