16 
BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
GLYCYMERIS MIGUELIANA Dali, 1916. 
Proc. U. S. Nut. Mus., vol. 52, No. 2183, p. 402. 
Cape Blanco, Oregon, to Magdalena Bay, Lower California, and the Cortez 
Bank. ^cS. . Lt/s 
GLYCYMERIS MULTICOSTATA Sowerby, 1832. 
Proc. Zool. Soc., p. 195 ; Conch. Icon., Pectunculus, pi. 5, fig. 26. 
(?) Monterey, California, to Gulf of California, and Guayaquil. 
Genus LIMOPSIS Sasso, 1827. 
LIMOPSIS SKENE A Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 402. 
Bowers Bank, Bering Sea, 30 fathoms. 
LIMOPSIS AKUTANICA Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 403. 
Off Akutan Island, Aleutians, 72 fathoms. 
LIMOPSIS DIEGENSIS Dali, 1908. 
Bull. Mus. Comp. ZooL, vol. 43, p. 395, pi. 15, figs. 13, 15. 
Santa Barbara Islands to Coronado Island. 
Section EMPLECONIA Dali, 1908. 
LIMOPSIS VAGINATUS Dali, 1891. 
Proc. U. S. Nat. Mus., vol. 14, p. 190 ; vol. 17, p. 713, pi. 25, figs. 3, C, 7. 
Bering Sea and Aleutian Islands. 
Genus ARCA Linnaeus, 1758. 
Subgenus Barbatia Gray, 1847. 
Section FOSSULARCA Cossmann, 1887. 
BARBATIA SOLIDA Broderip and Sowerby, 1833. 
Proc. Zool. Soc., p. 18 ; Conch. Icon. Area, pi. 16, fig. 106. 
San Diego, California, to Panama. 
Section ACAR Gray, 1847. 
BARBATIA RETICULATA Gmelin, 1792. 
Syst. Nat., vol. 7, p. 8311 ; Conch. Icon. Area, pi. 16, fig. 108. 
San Diego to Ecuador. Also Atlantic. 
Subgenus Scapharca Gray, 1847. 
SCAPHARCA MULTICOSTATA Sowerby, 1833. 
Proc. Zool. Soc., p. 21 ; Conch. Icon. Area, pi. 4, fig. 23. 
San Diego, California, to Gulf of California. 
Section BATHYARCA Kobelt, 1891. 
SCAPHARCA NUCLEATOR Dali, 1908. 
Bull. Mus. Comp. Zool., vol. 43, p. 397, pi. 18, fig. 9. 
San Diego, California, to Panama. 
