Cladocera 7 e 



3. August 10, 1915. Bernard harbour, Northwest Territories. Lake on 

 tundra. Common; some females with ephippia. 



4. August 16', 1915. Bernard harbour, Northwest Territories. Tundra 

 ponds (see fig. 4) on top of ridge. Elevation about 100 feet. Various sizes, 

 common. 



5. July 26, 1916. Cape Bathurst, Northwest Territories. Waterhole in 

 brook-swamp on tundra. Much vegetation. Various sizes, few. 



So far this species has been found only in high northern latitudes. It has 

 been reported from Nova Zembla, lake Enara in Finnish Lapland, Greenland, 

 Labrador, Bering island, and St. Paul island. 



F. Johansen, photo. 

 Fig. 4. — Pond on ridge at Bernard Harbour, Northwest Territories, July, 1916. 



Alona guttata G. 0. Sars. 



Three mature females of this species were found in a plankton haul obtained 

 from tundra ponds (see fig. 4) on top of ridge southwest of Bernard harbour, 

 Northwest Territories, on July 3, 1916. Elevation about 100 feet. Tempera- 

 ture of water 55° F.; air 50° at 3.30 p.m. 



Chydorus sphaericus (O. F. Mueller). 



This cosmopolitan form was noted in five samples of plankton as follows :— 



1. August 3, 1913. Teller (Port Clarence), Alaska. Brackish pond between 

 big lake and sea. One specimen, a female. 



2. August 16, 1915. Bernard harbour, Northwest Territories. Tundra 

 ponds (see fig. 4) on top of ridge southwest of the harbour. Elevation about 

 100 feet. Collected at margin! One dark brown specimen. 



3. September 23, 1915. ' Bernard harbour, Northwest Territories. Brack- 

 ish pond near creek outlet. Ice 1 foot; water 3 to 4 feet. Few. 



4. July 3, 1916. Bernard harbour, Northwest Territories. Tundra ponds 

 (see fig. 4) on ridge southwest of the harbour. Temperature of water 55° F., air 

 50°. Few, some females with summer eggs. 



5. July 26, 1916. Cape Bathurst, Northwest Territories. Waterhole in 

 brook-swamp on tundira. Much vegetation. Few. 



This species is world wide in its distribution. In the north it has been 

 found in northern Europe and Asia, Nova Zembla, Spitzbergen, Greenland, 

 Newfoundjand, and the New Siberian islands. 



