38 RECENT BIVALVE MOLLUSKS 



Genus Cumingia Sowerby, 1833. 



Cumingia lamellosa Sowerby, 1833. 



Crescent City, Cal., south to Payta, Peru. Japan? 



Fainily Donacidse 

 Genus Donax Linne, 1758. 



Donax californica Conrad, 1837. 



San Pedro, Cal., to Panama. 

 Donax laevigata Deshayes, 1854. 



Santa Barbara, Cal., to Acapulco. 

 Donax punctostriata Hanley, 1843. 



San Pedro, Cal., to Payta, Peru. 

 Donax conradi Deshayes, 1854. 



San Diego, Cal., to Central America. 



Fainily Psammobiidse 

 Genus Psammobia Lamarck, 1818. 

 Siibi^enus Gobraeus Leach, 1852. 



Gobraeus regularis Carpenter, 1864. 



San Diego, Cal., to Cape St. Lucas. 

 Gobraeus californicus Conrad, 1848. 



Japan, Kamchatka, the Aleutian Islands and south to San 



Diego, Cal. 

 Gobraeus edentulus Gabb, 1869. 



San Pedro and Catalina Island, Cal., to San Diego. Also 



Pliocene of Cal. 



Genus Sanguinolaria Lamarck, 1799. 

 Section Nuttallia Dall, 1-897. 



Sanguinolaria nuttallii Conrad, 1837. 

 San Pedro to San Diego, Cal. 



Genus Heterodonax Morch, 1853. 



Heterodonax bimaculata Linne. 1758. 



Monterey, Cal., to Panama. Also Atlantic. 



Genus Tagelus Gray, 1847. 



Tagelus californianus Conrad, 1837. 



Santa Barbara, Cal., to Gulf of Tehuantepec. 

 Tagelus affinis C. B. Adams, 1852. 



Santa Barbara, Cal., to Panama. 



