34 
BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
THYASIRA BARBARENSIS Dali, 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 Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 409. 
Off Santa Barbara Islands, California, in 1,100 fathoms. 
Subgenus Axintjlus Verrill and Bush, 1898. 
AXINULUS FERRUGINOSUS Forbes, 1844. 
Hep. Brit. Assoc, for 1843, p. 192. — Fokbes 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 Gonld, 1862. 
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. 
