MOLLUSCA 



Family Viviparidae. 

 Campeloma decisa, Say. 



GASTEROPODA PULMONATA (TEBRESTRIAL). 



Family Helicidae. 

 Vallonia pulchella, Miiller. (L). 

 Polygyra tridentata, Say. (B). Scarborough Bluffs. 

 " albolabris, Say. Don River. 



palliate, Say. (B). 

 " monodon, Rackett. (B). 



Family Pupidae. 



Bifidaria armifera, Say. (L). Humber River. 

 Vertigo milium, Gould. Scarborough Bluffs. 



Family Achatinidae. 

 Cochlicopa lubrica, Miiller. (L). Humber River. 



Family Circinariidae. 

 Circinaria concava, Say (B). 



Family Zonitidae 



Vitrea cellaria, Miiller. (B), (L). 

 Zonitoides arborea, Say. (L). Don River, Humber 



River, Centre Island. 

 Gastradonta ligera, Say. 

 Omphalina fuliginosa, Griffith. (L). 



Family Limacidae. 

 Agriolimax agrestis, Linnaeus. (L). Don River, 



Humber River, Centre Island. 

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