16 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 



GLYCYMERIS MIGUELIANA Dall, 1916. 



Proc. U. S. Nut. Mus., vol. 52, No. 2183, p. 402. 



Cape Blanco, Oregon, to Magdalena Bay, Lower California, and the Cortez 

 Bank. 



GLYCYMERIS MULTICOSTATA Sowerby, 1832. 



Proc. Zool. Soc, p. 195 ; Conch. Icon., Peetunculus, pi. 5, fig. 26. 

 (?) Monterey, California, to Gulf of California, and Guayaquil. 



Genus LIMOPSIS Sasso, 1827. 



LIMOPSIS SKENEA Dall, 1916. 



Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 402. 

 Bowers Bank, Bering Sea, 30 fathoms. 



LIMOPSIS AKUTANICA Dall, 1916. 



Proc. U. S. Nat. Mus., vol. 52, No. 21S3, p. 403. 

 Off Akutan Island, Aleutians, 72 fathoms. 



LIMOPSIS DIEGENSIS Dall, 1908. 



Bull. Mus. Comp. Zool., vol. 43, p. 305, pi. 15, figs. 13, 15. 

 Santa Barbara Islands to Coronado Island. 



Section EMPIECONIA Dall, 1908. 



LIMOPSIS VAGINATUS Dall, 1891. 



Proc. U. S. Nat. Mus., vol. 14, p. 190 ; vol. 17, p. 713, pi. 25, figs. 3, 6, 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. 1G, fig. 10G. 

 San Diego, California, to Panama. 



Section ACAR Gray, 1847. 



BARBATIA RETICULATA Gmelin, 1792. 



Syst. Nat., vol. 7, p. 3311 ; Conch. Icon. Area, pi. 1G, fig. 108. 

 San Diego to Ecuador. Also Atlantic. 



Subgenus Scapharca Gray, 1S47. 



SCAPHARCA MULTICOSTATA Sowerby. 1833. 



Proc. Zool. Soc, p. 21 ; Conch. Icon. Area, pi. 4, fig. 23. 



San Diego, California, to Gulf of California. t 



Section BATHYARCA Kobelt, 1891. 



SCAPHARCA NUCLEATOR Dall, 1908. 



Bull. Mus. Comp. Zool., vol. 43, p. 397, pi. 18, fig. 9. 

 San Diego, California, to Panama. 



