24 a Canadian Arctic- Expedition, 1913-1918 



Cosmarium granatum Br6b. 



This desmid was almost as plentiful as C. Botrytis and was found in almost 

 as many localities. It was found in the brackish pond as well as in the fresh- 

 water pond at Teller, and also occurred at CoUinson point and Demarcation 

 point, and at Bernard harbour. 



Cosmarium Hammeri Reinsch 



This species has world-wide distribution and is as frequent in the arctic 

 as in the tropics. It only appeared in the collections from the big lake at Bernard 

 harbour where it was fairly plentiful. The size of all specimens was a little below 

 the average. 



Cosmarium Holmiense Lund. var. integrum Lund. 



- This variety is well distributed in northern waters. It was found in collec- 

 tions from the big pond at Bernard harbovir and in a pond in the second bay- 

 east of Bernard harbour. All specimens were characteristic of the variety. 



Cosmarium humile (Gay) Nordst. var. striatum (Nordst.) Schmidle 



(Plate m, fig. 11) ' 

 This small desmid has not been previously recorded from the arctic regions- 

 of America. It was found by the expedition in two localities, at Teller, where 

 it was found in the brackish pond as well as in the freshwater pond, and at 

 Bernard harbour, amongst stones and other algae in the river bed. 



Cosmarium impressulum Elfv. 



This is a widely distributed species and fairly common in the arctic. It 

 was found in the lake at Teller, and in the lake at Bernard harbom'. At the 

 latter place it was found with other algae in summer collections, also once in 

 plankton taken under the ice in winter, February 28, 1916. 



Cosmarium inconspicuum W. and G. S. West (Plate III, fig. 19) 



This is one of the rarest desmids collected by the expedition. Only four 

 individuals were seen from a pond in the second bay east of Bernard harbour,. 

 June 16, 1915. This species has only been previously recorded from Great 

 Britain and Ireland. 



Cosmarium margaritatumi (Lund.) Roy and Biss. 



This is a generally distributed species much resembling C. conspersum. The 

 punctulations between the granules, which distinguish it from C. conspersum, 

 were well marked. It occurred at Teller and at Herschel island, along with 

 other desmids. It was fairly numerous. 



Cosmarium ochthodes Nordst. 



This species was found in two collections from the big lake at Bernard 

 harbour, but was not abundant. It was more common at Herschel island. 

 Here, some of the granulations were irregular as in var. amoebum W. West^ 

 but otherwise they were typical of the specific type. 



Cosmarium Pokornyanum (Grun.) W. & G. S. West 



This small desmid was only found in the collection from the pond in the 

 second bay east of Bernard harbour. However, it was not very scarce. It 

 varied in size, being from 20-35^ in length and 12-18^ in breadth. 



