1918] Packard: Quantitative Analysis of Molluscan Fauna 



305 



prising, then, that Maconia halthica and Mytilus eclulis have a general 

 distribution within San Francisco Bay, when the same species are 

 able to endure the rigors of the littoral zone of the North Sea, north 

 Atlantic Coast, and western coast of North America. Thais lamellosa 

 and Zirfaea gahhi also have wide ranges on the West Coast and are 

 closely related to if not identical to Atlantic Coast species. 



TABLE 1 



Complete Eecord of the Quantitative Hauls 



