148 THE CANADIAN NATURALIST. [J 



line 



N. minutisslma, Sm. — Common. Mono Mills; Island Ponds, 

 Toronto. 



AMPHIPLEURA, KUTZ. 



A. peUucuJa, Kiitz. — Rare. Grenadier Pond. 



NAVICULA, BORT. 



JV. cuspidata, Kutz. — Common. Sandy Cove ; Niagara Falls. 



JV. lanceolata, Kutz. — Common. Desjardin Canal; Humber 

 Ponds; Don Marsli. 



iV! ovalis, Sm. — Rare. River Thames, London. 



iV. amphirhi/nchvs, Ebr. — Rare. Desjardin Canal. 



iV. rhomhoides, Ehr. — Common. Burlington Beach. 



JSf. affinis, Ehr. — Common. Sandy Cove ; Grenadier Pond. 



N. tiimida, Sm. — Rare. Toronto Bay. 



iV. crassinervia, Ehr. — Rare. Sandy Cove ; Pond at Ancaster. 



iV". sphcerophora, Kutz. — Rare. Niagara Falls. 



iVi amhigua, Ehr. — Not uncommon. Don River ; Kempenfelt 

 Bay; Welland Canal. 



N. amphishcena, Bory. — Common. Niagara River, above the 

 Falls. 



iV. producta, Sm. — Rare. Pond at Dundas. 



PINNULARIA, EHR. 



P. major, Sm. — Common. Sandy Cove ; Humber Ponds. 



P. gihha, Ehr. — Common. Clifton ; Mono Mills ; Don River- 



P. stauronetformis, Sm. — Rare. Grenadier Pond. 



P. nohilis, Ehr. — Not uncommon. Grenadier Pond ; Desjardin 

 Canal. 



P. acuta, Sm. — Rare. Stream at London. 



P. viridis, Sm. — Common. Humber Ponds; Burlington Bay. 



P. mesolepta, Ehr. — Rare. Grenadier Pond. 



P. acuminata, Sm. — Rare. Sunken boat at mouth of Humber. 



P. ohJonga, &m. — Common. Grenadier Pond ; Oakville. 



P. acrospha'ria, Sm. — Common. Humber Ponds ; Thames, 

 London. 



STAURONEIS, EHR. 



S. PJicenicenteron , Ehr. — Not uncommon. Grenadier Pond, 

 >S^. acuta, Sm. — Rare. Sandy Cove ; River Don. 

 S. dilatafa, Sm. — Rare. Burlington Bay. 

 S. gracilis, Ehr. — Common. Island Ponds, Toronto ; Humber 

 Ponds. 



