MOLLUSCA 
Family Viviparidae. 
Campeloma decisa, Say. 
GasTEROPOoDA PuLtmMonata (TERRESTRIAL). 
Family Helicidae. 
Vallonia pulchella, Miiller. (L). 
Polygyra tridentata, Say. (B). Scarborough Bluffs. 
albolabris, Say. Don River. 
a palliata, Say. (B). 
s monodon, Rackett. (B). 
Family Pupidae. 
Bifidaria armifera, Say. (L). Humber River. 
Vertigo milium, Gould. Scarborough Bluffs. 
Family Achatinidae. 
Cochlicopa lubrica, Miller. (L). Humber River. 
Family Circinariidae. 
Circinaria concava, Say (B). 
Family Zonitidae 
Vitrea cellaria, Miller. (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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