173 



On the shores of the Strait of Juan de Fuca at Esquimalt and 

 Victoria, B. C. and Mats-mats Bay, Washington, as well as near 

 Seattle and on San Juan and Whidbey Islands, Washington. The 

 species so far seems to he confined to this very limited area in Pu- 

 get Sound (as used in the hroader sense) and to occupy a region 

 of transitional forms, between the areas of distribution of C. simplex 

 on the south and C. rosa marina on the north. 



University of California. 



Berkeley, California, U. S. A. July 7, igo6. 



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