12 A Canadian Arctic Expedition, 1913-1918 



List of Species. 



, MYXOPHYCEAE. 

 COCCOGONEAE. 



CHROOCOCCACEAE. 

 Chroococcus Nag. 

 Chroococcus litnneticus Lemm. 



This typical plankton organism was not common in any one particular 

 collection although it occurred in samples from various localities. The cells 

 were all a little below average size. It was found in material from a tundra 

 pond, Collinson point, in the plankton of the big lake at Bernard harbour, on 

 a gelatinous mass (an Ophrydium sp? Protozoa) from the lake at Bernard 

 harbour, and amongst stones from the river bed at the same place. 



Chroococcus macrococcus (Kiitz.) Raben. 



This was found along with Nostoc commune Vauch. and other algae from 

 the bottom of a dried tundra pond near Bernard harbour, and in a tundra pond 

 at Collinson point. Common. 



Chroococcus pallidus Nag. 



This alga has not been previously recorded from arctic waters and in North 

 America has only been found in Lake Erie. A few small yellowish gelatinous 

 masses of this species, each mass composed of 4 or 8 cells, were found in the bottle 

 containing the Ophrydium from the lake at Bernard harbour. 



Chroococcus turgidus (Ktitz.) Nag. 



This is perhaps the commonest species of this genus in arctic regions. It 

 was found in the tundra collections, the bottom deposits, and the plankton at 

 Bernard harbour. It occurred also at Herschel island, and in the brackish pond 

 as well as the freshwater lake at Teller. 



Gloeocapsa Kiitz. 

 Gloeocapsa magma (Br6b.) Kiitz. 



^'* Although this species occurs fairly frequently in arctic regions, I only found 

 it in material from the lagoon lake at Teller. It was not so darkly coloured 

 as usual, but this may have been due to long standing in alcohol after being 

 collected. 



Gloeocapsa rupestris Kiitz. 



This occurred in the dry tundra pond along with Nostoc commune at Bernard 

 harbour, and in the lagoon lake at Teller. 



Aphanocapsa Nag. 

 Aphanocapsa elachista W. and G. S. West 



This plant is identical with some plants taken from Lake Winnipeg, 

 Manitoba, and frdm the Lake of the Woods, Ontario; and it was identified by 

 the late Professor G. S. West as this species. It has not been previously recorded 

 in arctic regions and is not common in North America. It occurred in small 

 quantity in some mud from Bernard harbour and in one sample of plankton 

 (September 26, 1916) from the big lake at Bernard harbour. 



