The leeches or bloodsuckers are partly carnivorous and partly parasitic on our aquatic Vertebrates (principally fish and turtles). For the following list of Toronto species I am indebted to Miss C. G. S. Ryerson.
Glossiphonia stagnalis (L.)—shores and pools everywhere. (Harbour by Nichol-son as Clepsine submodesta.)
complanata (L.)—Humber, Toronto
Bay, Don. (Harbour by Nichol-son as Clepsine patelliformis).
Placobdella parasitica (Say)—Etobicoke, Weston.
Erpobdella punctata (Leidy)—shores and pools everywhere. (Harbour by Nichol-son as Nephelis lateralis.)
Piscicola (?) milneri (Verrill).—Humber. Placobdella pitta (Verrill)—Grenadier Pond. Haemopis marmoratus (Say)—Etobicoke.
These curious " moss-animals " are sedentary. They are found growing in colonies as much as a foot in diameter, attached to all sorts of objects in the water.
Paludicella articulata (Ehrenberg)--Georgian Bay.*