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MOLLUSCA

Planorbis bicarinatus, Say (B), (L). Grenadier Pond, Etobicoke Creek, Humber River.

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, Etobicoke 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, Etobicoke Creek, Centre Island, Don River.

"   emarginata, Kiister.

Bythinia tentaculata, Linne. (L).

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