150 



MOLLUSCA. 



lected. altho the place seemed almost too dry to support molluscan life. 

 42. Tamarack swamps. Around the most of Rush Lake, there are 

 large tamarack swamps with the characteristic vegetation of tamaracks, 

 sphagnum, black spruces, pitcher plants, sun-dews, poison sumach and 

 huckleberries. Most of these places are without any molluscan life, 

 but in the sphagnum in a very wet portion, a few specimens of Vitrea 

 hammonis, Agriolimax campestris, Pisidium roperi, Lymnaea palustris, 

 Musculium truncatum, and M. securis were collected. 



Darlvatlon of the Sand Diine Habitats. 



2. Rocky shores. 



5. Unprotected, sandy shores. 37. Overhanging rock lodge. 



7, Protected, 'sandy an ores. \&. Sand pools^ 28, 29. Sand dunes. 18, 19. Swamps. 



88, 29. Sand dunes >y8. Coves. 25. Sand beaches. 9. Long, 'shallow lake*. 18,19.Swainp8» 



\ 

 16, 19. Swamps. 10. Round, deep lakes. 



19. Perennial swamps 



II 



18. Temporary swamps 



II 



26. Alluvial flats. 



