14 RECENT BIVALVE MOLLUSiKS 



Glycymeris multicostata Sowerby, 1832. 



(? Monterey, Cal..) to Gnlf of Cal. and Costa Rica. 



Genus Limopsis Sasso, 1827. 

 Section Limopsis s. s. 



Limopsis skenia Dall, 1916. 



Bowers Bank, Bering- Sea, 30 fathoms. 

 Limopsis akutanica Dall. 1916. 



Off Akutan Island, Aleutians, 72 fathoms. 

 Limopsis diegensis Dall, 1908. 



Santa Barbara Islands to Coronado Islands. 



Section Empleconia Dall, 1908. 



Limopsis vaginatus Dall, 1891. 



Bering- Sea and Aleutian Islands. 



Genus Area Linne, 1758. 



Subgenus Barbatia Gray, 1847. 



Section Fossularca Cossmann, 1887. 



Barbatia solida Broderip and Sowerby, 1833. 

 San Dieg-o, Cal., to Panama. 



Section Acar Gray, 1847. 



Barbatia reticulata Gmelin, 1792. 



San Diego to Ecuador. Also Atlantic. 



Subgenus Scapharca Gray, 1847. 



Scapharca multicostata Sowerby, 1833. 



San Dieg-o, Cal., to Gulf of California. 



Section Bathyarca Kobelt. 1891. 



Scapharca nucleator Dall, 1908. 



San Diego, Cal., to Panama. 

 Scapharca (corpulenta Sn-iith, 1885, variety ?) pompholyx Dall, 

 1908. 



Ofif Santa Barbara, Cal., to the Galapag-os Islands and 



Mid Pacific, in deep water. 



Superfamily Pteriacea 



Family Pinnidae 



Genus Atrina (Gray) Adams, 1857. 



Atrina oldroydi Dall, 1901. 



Off San Pedro, Cal., in 2? fathoms. 



