1870.] OSLER — ON CANADIAN DIATOMACEyE. 147 



A. minutissima, Sm. — Karc. Sunken boat at mouth of lliver 

 Iluinbcr. 



COCCONEIS, EIIR. 



C. Thwaitesli, Sm. — Common. Grenadier Pond. 

 C, pcdlculus, Ehr. — Very common. Constantly attached to 

 Cladophora glomerata in the fall. Wharves at Toronto. 

 C. Placentula, Ehr. — Kare. "Wharf at Orillia. 



CYCLOTELLA, KUTZ. 



C. Kutzingiana, Thw. — Frequent. Stream at London ; Des- 

 jardin Canal ; Grenadier Pond. 



C. opcrculafa, Kutz. — Eare. Sandy Cove ; Lake Simcoe. 

 C. rotula, Kutz. — Hare. Pond Mills ; London. 



SURIRELLA, TURP. 



S. splendida, Kutz. — Common. Pond near Clifton House, 

 Niagara Falls, (numerous) ; Grenadier Pond ; London. 



iS. nohilis, Sm. — Rare. Sandy Cove; Lake Simcoe. 



S. minuta, De Breb. — Rare. University Pond, Toronto ; Stream 

 near Weston, (Rev. W. A. Johnson.) 



S. hiscriata, DeBreb. — Rare. Burlington Bay. 



S. craticida, Ehr. — Very rare. Sandy Cove ; Lake Simcoe. 



S. linearis, Sm. — Not uncommon ; Grenadier Pond. 



TRYBLIONELLA, SM. 



T. angustata, Sm. — Rare. Marsh at Dundas. 



CYMATOPLEURA, SM. 



C. solea, Sm. — Common. Don River ; Grenadier Pond. 

 C. elUptica, Sm. — Uncommon. Mouth of the Ilumbcr. 

 C. opiculata, Sm. — Common, with (J. solea. 



NITZSCIIIA, IIASS. 



JSf. sigmoidea, Sm. — Not uncommon. Humber Ponds; Bur- 

 Hngton Bay. 



iV. JBrehissoni, Sm. — Rare. Barrie ; Don River. 



JV. ampliioxijs, Sm, — Not uncommon ; Island Ponds, Toronto. 



N. acicularis, Sm. — Rare. Niagara Falls. 



iV. tomis, Sm. — Rare. Wharf at Orillia. 



