12 postelsia 



2. River bed formation. 



(/ Banks and channel. 

 b Rivers and streamlets. 



3. Lake beach formation. 



a Front beach. 

 b INIid beach. 

 c Back beach. 



4. Lake formation 

 I. Marine formations. 



Vegetation of the tidal area. 

 I . Algal formation. 



Marine vegetation, as built up along the 

 shores of Vancouver Island, falls into two gen- 

 eral categories as indicated in the above synopsis. 

 Since it is not the province of this essay to deal 

 with the former of these two, it will merely be 

 alluded to in passing. 



It is well known that this part of the west 

 coast of North America shows an unusual de- 

 velopment of forms belonging to the Rhodophy- 

 ceae and especially the Phacophyceae. Some of 

 the larger kelps like Nereocystis, Laminaria^ 

 Alaria, Egregia, Lessonia, PterygopJiora, etc., not 

 only attain here great proportions but also occur 



