Plate VIII. 



Fig. 32. Shore of Burwash pond, showing Sphagnum-cassandra zone, with back- 

 ground of black spruce. Habitat of Group lib. 



Fig. 33. "Pond on Split-rock Island," showing Sphagnum-cassandra zone. Habitat 

 of Group lib, especially Leucorrhinia frigida and Nehalennia gracilis. 



