OF THE NORTHWEST COAST OF AMERICA 39 



Subgenus Mesopleura Conrad, 1837. 



Mesopleura subteres Conrad, 1837. 



Santa Barbara, Cal., to Panama. 



Supcrfauiily Solenacea 



Family Solenidae 



Genus Solen (L.) Scopoli, 1777. 



Solen sicarius Gould, 1850. 



A'ancouver Island to San Diego, Cal. 

 Solen rosaceus Carpenter, 1863. 



Santa Barbara, Cal., to Gulf of California. 



Genus Ensis Schumacher, 1817. 



Ensis calif ornicus Dall, 1899. 



Monterey, Cal., to Gulf of California. 



Genus Siliqua Megerle. 1811. 



Siliqua lucida Conrad, 1837. 



Monterey, Cal., to Todos Santos Bay, Lower California. 

 Siliqua media Gray, 1839. 



Arctic Ocean and south to the Okhotsk Sea, Bering Sea, 



and eastward to Cook's Inlet, Alaska. 

 Siliqua patula Dixon, 1788. 



The Okhotsk Sea, the southern border of Bering Sea and 



eastward to Sitka, Alaska. 



Siliqua patula var. alta Broderip and Sowerby, 1829. 



Bering Strait, south to Unalashka and eastward to Kadiak 



Island, Alaska. 

 Siliqua patula var. nuttallii Conrad, 1837. 



Lituya Bay. Alaska, and south to Monterey, Cal. 



Superfaniily Mactracea 



Family Mactridae 



Genus Labiosa (Schmidt) Moller, 1832. 



Labiosa undulata Gould, 1851. 



San Pedro, Cal., to Panama. 



Genus Mactra Linne, 1758. 

 Subgenus Mactrotoma Dall, 1894. 

 Mactrotoma dolabriformis Conrad, 1837. 



Lobitas, Cal., to Topolobampo, Mexico. 

 Mactrotoma californica Conrad, 1837. 



Neeah Bay, AA'asli., to San Diego, Cal. 

 Mactrotoma nasuta Gould, 1851. 



San Diego, Cal., in Gulf of California. 



