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1870.] OSLER — ON CANADIAN DIATOM ACE^E. 149 



S. punctata, Kutz. — Kare. River Don. 



S. linearis, Ehr. — Very rare. Pond near Niagara Falls. 



S. anceps, Ehs. — Common. De^jarJin Canal ; Kempenfelt Bay. 



PLUROSIGMA, SM. 



P. attenatum, Sm. — Not uncommon. Outlet of Grenadier 

 Pond; Don Marsh; iiurliugton Beach. 



P. Spencerii, Sm. — Rare. Mr. Saunders' farm, London ; Des- 

 jardin Canal. 



SYNEDRA, EHR. 



S. luiiaris, Ehr. — Bare. Humber Bay ; Stream at Barrie. 

 S, tninutissimay Kutz. — Common. River Thames, London. 

 S. radians, Sm. — Very common. Streams at Dundas, Weston, 

 Paris, London, etc. 



S. capitata, Ehr. — Common. Sandy Cove ; Grenadier Pond. 

 S. ulna, Ehr. — Not uncommon. Niagara Falls ; Humber Bay. 

 S. hngissima, Sm. — Rare. Sunken boat, Humber River. 

 S. fasciculata, Kutz. — Common. Stream at London. 



COCCONEMA, EHR. 



C. lanccolatum,Wi\v. — Common. Grenadier Pond ; Desjardin 

 Canal. 



C. parvum, Sm. — Rare. Pond at Ancaster. 



C. cistula, Ehr. — Not uncommon. Sandy Cove; Humber Bay. 



GOMPHONEMA, AG. 



G. geminatum, Ag. — Common. On Cladopliora glomerata, in 

 swiftly running streams, and on wharves. 



G. oUvaceum, Ehr. — Common. Trinity College stream, and 

 streams at Weston. 



G. acuminatum, Ehr. — Not uncommon. Grenadier Pond. 



G. cristatum,, Ralfs. — Rare. Mouth of the Humber. 



G.dicJiotomum,Kuiz. — Common. Wharves, Toronto; Grena- 

 dier Pond ; St. Lawrence, at Prescott, (Rev. W. A. Johnson.) 



G. curvatum. — Not uncommon. Grenadier Pond ; Desjardin 

 Canal. 



MERIDION, AG. 



31. circulare, Ag. — Common. Cedar swamp, Weston; streams 

 at WesLon, Dundas, and Toronto. 



31. constriction, Ralfs. — Rare. Island Pond, Toronto. 



