Skinner: tide pool vegetation of port Renfrew. 153 



2. Cheilosporum planiusculum. 

 Associated with No. I. 



3. Amphiroa cretacea. 



Covering a group of mussels on the southeast below No. 1. 



4. Halosaccion hydrophora. 



A very imperfect specimen was found under the overhanging 

 ledge on the south. 



Pool No. VIII. 



Location. — Low-tide pool. About ten feet from the end of 

 the ridge. 



Exposure to Tide. — The waves enter from the southwest 

 and drain to the southwest. Subject to a strong back flow. 

 The pool is free from the surf but a few minutes at a time dur- 

 ing low tide. During high tide the pool receives both surf and 

 surge. 



Shape and Dimensions. — Irregular in shape. Consisting of 

 a rather shallow part on the north and a smaller deeper part on 

 the south. Sides and bottom covered with mussels except the 

 small pool on the south which has its bottom covered with pebbles. 



Dimensions eight feet by six feet. Depth of small pool two 

 and one half feet. 



Flora : Kind and Distribution. 



1 . Corallina aculeata. 



Occurs around the edge of the pool and sparingly over the 

 bottom. 



2. Cheilosporum calif ornicum. 

 Occurs over the bottom on the mussels. 



3. Laminaria clustoni. 



Several small plants on the north in exposed position. 



4. Hedophyllum subsessile. 

 Abundant over the pool. 



5. Alaria sp. 



A few plants occur on the bottom in an exposed position. 



6. Iridasa sp. 



A few plants found with No. 3. 



7. Lessoniopsis littoralis. 



Several plants occur on the edge of the deeper pool. Greatly 

 exposed to the surf. 



