Occasional Papers of the Museum of Zoology 15 



lilies were also quite abundant. In high water the river floods 

 this channel and probably cleans it out to some extent. 



Habitat 13. Ash-cedar Swamp. As mentioned in the gen- 

 eral discussion, the valley of the East Branch was connected 

 with the main river by an old channel. This has become a 

 large, wooded swamp, many portions of which are covered 

 with water throughout the year. The bottom is soft and 

 mucky in this place and the roots of the trees with the humus 

 around them divide the swamp into numerous small ponds, 

 and prevent rapid evaporation and run-off. These trees were 

 mainly wdiite cedars (Thuja occidentalis) and the black spruce 

 (Picea mariana), but there were a few scattered elm trees and 

 a considerable growth of tag alders (Alnus incana) and bal- 

 sam firs (Abies balsaiiica) skirted the edge. Carex retrorsa 

 was the most abundant sedge throughout the main portion. 



TABI.E II. Habitats of the Ponds (12-19) 



