Freshwater Diatoms 39 a 



Epithemia turgida (Ehr.) Kutz. var. Westermanii Kiitz. 



In addition to being found in fair quantity along with the species this 

 variety was also found at Martin point, June, 1914, and on the Ophrydium mass 

 from the lake at Bernard harbour, August, 1915. 



Epithemia zebra (Ehr.) Kiitz. 



This small member of the genus was not common and only occurred in two 

 samples obtained in July and August, 1913, at Teller. 



NlTZSCHIEAE. 



Hantzschia Grun. 

 Hantzschia amphioxys (Ehr.) Grun. 



This species was found in small quantities in the lagoon lake at Teller, 

 August, 1913, in a tundra pond at CoUinson point, June, 1914, and at Bernard 

 harbour, June, 1915. 



Nitzschia Hass. 

 Nitzschia acuminata (W. Sm.) Grun. 



Only a few frustules of this species were seen in a sample from the lagoon 

 lake at Teller. It is normally a brackishwater type. 



Nitzschia Br^bissonii W. Sm. 



This species also was only recorded from the brackish pond at Teller, 

 August, 1913. It is a brackishwater species. 



Nitzschia Closterium W. Sm. 



Like the preceding species this is a brackishwater type and was found in 

 the brackish pond at Teller. Rare. 



Nitzschia lanceolata W. Sm. 



This is another of the brackish forms from the brackish pond at Teller. 

 Not common. 



Nitzschia Tryblionella Hantz. 



The type form of this species was found in the lagoon lake at Teller. 



Nitzschia Tryblionella Hantz. var. littoralis Grun. [N. littoralis Grun.] 



This diatom was found in the lagoon lake at Teller, July and August, 1913, 

 and in a fish stomach obtained at Bernard harbour, October 4, 1915. Not 

 abundant. 



Nitzschia scutellum S.B.D. 



This species was found in the same collections at Teller as the last named 

 one and was about as frequent. 



Nitzschia sigmoidea (Ehr.) W. Sm. 



This species was found in a number of collections from Teller and in a 

 sample from the tundra pond at ColUnson point; also one frustule in a fish 

 stomach, October 4, 1915, at Bernard harbour. 



Nitzschia stagnorum Rab. 



Two frustules of this species were seen in the material from a fish stomach, 

 secured October, 1915, at Bernard harbour. 



