OF THE NORTHWEST COAST OF AMERICA 41 



(iciiiis Sphenia Tnrton, 1822. 



• 



Sphenia fragilis Carpenter, 1857. 



Oregon to Mazatlan. 

 Sphenia ovoidea Carpenter, 1865. 



Aleutian Islands to Puget Sound and San Diego 

 Sphenia trunculus Dall. 1916. 



San Diego. Cal., to Panama. 

 Sphenia pholadidea Dall, 1016. 



Santa Barbara, Cal. 



Gcinis Platyodon Conrad, 1837. 



Platyodon cancellatus Conrad, 1837. 



Paulinas Bay, Cal., to San Diego, Cal. 



Family Corbulidae 

 Genus Corbula Brugiere, 1792. 



Corbula obesa Hinds, 1843. 



Catalina Island, Cal., to Panama. 

 Corbula fragilis Hinds, 1843. 



Monterey, Cal., to Salina Cruz, Mexico. 

 Corbula luteola Carpenter. 1865. 



Monterey, Cal., to San Diego. 

 Corbula porcella Dall, 1916. 



Santa Rosa Island, Cal., to Panama. 

 Corbula kelseyi Dall. 1916. 



Esteros Bay, to Catalina Island, Cal. 



Genus Grippina Dall, 1912. 



Grippina californica Dall, 1912. 

 Off San Diego Bay, Cal. 



Family SaxicavidcX 

 Genus Panope Menard, 1807. 



Panope generosa Gould. 1850. 



Puget Sound to San Diego, Cal. 

 Panope generosa Gould, var. sol id a Dall, 1898. 



Straits of Fuca to San Francisco Bay. 



Ge)tus i'anomya (Gray) Adams, 1858. 



Panomya (arctica Lam. 1819, Atlantic) variety tnrgida Dall, 1916. 



Unalashka to the Shumagin Islands, Alaska, 

 Panomya beringiana Dall, 1916. 



Eastern Berin"- Sea. 



