Freshwater Algae 19 a 



CHAETOPHORACEAE. 



Draparnaldia Bory. 



Draparnaldia glomerata (Vauch.) Ag. 



This alga was secured only from one locality, ' the Hippuris swamp at 

 Herschel island, where it was exceedingly abundant. 



Akontae. 



ZYGNEMACEAE. 



Mougeotia Agardh. 

 M ougeotia sp? 



A number of fragments without any reproductive stages occurred in the 

 big lake and other places at Bernard harbour. 



Zygnema Agardh. 



Zygnema stellinutn (Miill.) Ag. 



This alga was exceedingly plentiful in the Bernard harbour district. Aplano- 

 spore formation was found in the second bay east of Bernard harbour on June 

 16, 1915, and lateral and scalariform conjugation on August 6, 1915. Lateral 

 conjugation in Zygnema is not common. 



Spirogyra Link. 



Spirogyra inflata (Vauch.) Kiitz. 



This species occurred in the Hippuris swamp at Herschel island with all 

 stages of conjugation. A species with one chloroplast (probably this one), but 

 not in conjugation, was common at Bernard harbour, Chantry island, Pihuma- 

 lerksiak island, and at Teller; at this last place it was found in the brackish 

 pond as well as the freshwater lake. 



Spirogyra insignis (Hass.) Kiitz. 



In conjugation. Found only at Herschel island. It is not a common 

 arctic species. 



DESMIDIACEAE. 



Cylindrocystis Menegh. 



Cylindrocystis crassa De Bary (Plate III, fig. 4) 



This desmid occurred in large gelatinous masses at Collinson point. A 

 small quantity was also found in the pond in the second bay east of Bernard 

 harbour, June 16, 1915. This is the first arctic record for this species. Identifica- 

 tion was confirmed by the late Professor G. S. West. 



Penium Br^b, 



Penium cruciferum (De Bary) Wittr. (Plate III, fig. 7) 



This species was found in the lagoon lake at Teller. It is more sub tropical 

 than arctic; it has been recorded from Lapland but not from any other northern 

 or arctic region. 



Penium margaritaceum (Ehrenb.) Br6b. 



Although this species is fairly common in northern countries, it was only 

 found in the collection from the lagoon lake at Teller. 

 49069— 2i 



