150 THE CANADIAN NATURALIST. [June 



HIMANTIDIUM, EHR. 



H. arcus, Sm. — Not uncomnioD. Burlington Bay , Humber 

 Ponds. 



H. 2>ectinalc, Kuiz. — Common. Grenadier Pond; stream at 



Paris. 



M. majusy Sm. — Rare. Kempenfelt Bay. 



ODONTIDIUjI, kutz. 



0. mutahile, Sm. — Common. Saudy Cove ; Lake Simcoe ; 

 stream at London. 



0. Tabellarla, Sm. — Bare. Mouth of Dcsjardin Canal. 



0. parasiticum, Sm. — Bare. Sandy Cove ; Lake Simcoe. 



0. Harnsonii, Sm. — Frequent. Kempenfelt Bay; stream at 

 Dundas. 



0. anomalum, Sm. — Not uncommon. Don Marsli ; Grenadier 

 Pond. 



FRAGILARIA, LYNG. 



F. ccqmcina, Desm. — Common. Streams at Dundas, Toronto, 

 London, and Oakville. 



F. viresceiis, Balfs. — Not uncommon. Desjardin Canal. 



ACHNANTHES, BORY. 



A. exiUs, Kutz. — Not uncommon. Stream at Hamilton ; 

 Humber Ponds. 



DIATOM A, DEC. 



D. vulgarc, Bory. — Very common. Grenadier Pond and else- 

 where. 



D. dongatum, Ag. — Common. Desjardin Canal; stream at 



Orillia. 



TABELLARIA, EHR. 



T.flocculosa, Kutz.— Frequent. Humber Ponds; Burlington 

 Bay; Cedar Swamp, Weston. 



T. fenestrata, Kutz.— Common. Biver Thames, London. 



MELOSIRA, AG. 



31. vartans, Ag.— Common. Stream near Dundas ; wharves 

 at Toronto. 



ORTHOSIRA, THWAITES. 



0. oriclialcea, Sm. — Bare. Sandy Cove ; Lake Simcoe. 

 0. spinosa, Sm. — Rare. Buoy in Burlington Bay. 



