NATURAL HISTORY, TORONTO REGION 
Carterius tubisperma Mills—Sunnyside. 
Spongilla lacustris Linn.* 
= fragilis Leidy.* 
Ephydatia fluviatilis (L.) is probably the sponge 
recorded from Grenadier Pond by 
Goadby and Bovell as Spongia fluvia- 
tilis. 
Protozoa. 
These simplest forms of animal life form a con- 
siderable part of the plankton or floating life of our 
waters, and also occur in debris on the bottom and in 
moist situations of all kinds. Parasitic species are 
to be found in members of all the other groups, and 
they even parasitize other Protozoa. The few species 
reported from this district are,— 
(1) By Bovell, from the Humber and Island 
Ponds, 
Amoeba princeps. Kolpoda cucullus. 
Stentor caeruleus. Paramecium aurelia. 
Vorticella convallaria. Oxytricha gibba. 
Leucophrys patula. Chilodon cucullus. 
(2) By Acheson, from tap-water, 
Amoeba proteus. Dinobryon stipitatum. 
= radiosa. Salpingoeca fusiformis. 
Difflugia globulosa. Asterosiga sp. 
Actinophrys sol. Stylobryon petiolatum. 
Acanthocystis turpacea? Peridinium sp. 
Monas lens. Vorticella sp. 
Dinobryon sertularia. Stentor sp. 
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