34 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 



THYASIRA BARBARENSIS Dall, 1889. 



Proc. U. S. Nat. Mus., vol. 12, p. 261, pi. 8, fig. 9. 

 Fuca Straits to Gulf of California. 



THYASIRA EXCAVATA Dall, 1901. 



Proc. U. S. Nat. Mus., vol. 23, pp. 790. 818, pi. 39, figs. 12, 15. 

 Oregon to Gulf of California. 



THYASIRA TRICARINATA Dall, 1916. 



Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 409. 



Off Santa Barbara Islands, California, in 1,100 fathoms. 



Subgenus Axinulus Verrill and Bush, 1898. 



AXINULUS FERRUGINOSUS Forbes, 1844. 



Rep. Brit. Assoc, for 1843, p. 192. — Forbes and Hanley, Brit. Moll., vol. 2, 



p. 60, pi. 34, fig. 1. 

 Aleutian Islands. Also Atlantic and Arctic. 



Genus AXINOPSIS G. O. Sars, 1878. 



AXINOPSIS VIRIDIS Dall, 1901. 



Proc. U. S. Nat. Mus., vol. 23, p. 819, pi. 40, fig. 1. 



Arctic Ocean, on the west to Japan, on the east to the Aleutian and 

 Coronado Islands. 



AXINOPSIS SERICATUS Carpenter, 1864. 



Suppl. Rep. Brit. Assoc, p. 643; Proc. U. S. Nat. Mus., vol. 23, p. 819, 



pi. 40, fig. 2. 

 Aleutian Islands south and east to Puget Sound, and Catalina Island, 

 California. 



Family DIPLODONTIDAE. 



Genus DIPLODONTA Bronn, 1831. 



DIPLODONTA ALEUTICA Dall, 1901. 



Proc. U. S. Nat. Mus., vol. 23, p. 820, pi. 42, fig. 3. 



Cape Lisburne, Arctic Ocean, to the Aleutians and eastward to Sitka 

 Bay, Alaska. 



DIPLODONTA ORBELLA Gould, 1852. 



Proc. Boston Soc. Nat. Hist., vol. 4, p. 90; Boston Journ. Nat. Hist., vol. 6, 



pi. 15, fig. 3. 

 Pribilof Islands, Bering Sea, to Gulf of California. 



DIPLODONTA SUBQUADRATA Carpenter, 1855. 



Proc. Zool. Soc, p. 230. 



Catalina Island, California, to Panama. 



Subgenus Felaniella Dall, 1899. 



FELANIELLA SERICATA Reeve, 1850. 

 Conch. Icon. Lucina, pi. 9, fig. 55. 

 San Diego, California, to Panama. 



