NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 87 
ATRIMITRA? LOWEI Dali, 1903. (Plate 15, fig. 4.) 
Proc. Biol. Soc. Wusli., vol. 16, p. 173. 
Off Avalon, Catalina Island, California. 
Genus MITRA Lamarck, 1799. 
Section THALA H. and A. Adams, 1853. 
MITRA SOLITARIA C. B. Adams, 1852. 
I*anania Shells, p. 44 ; Proc. U. S. Nat. Mus., vol. 13, 
I’oint Lonia, California, to Panama. 
MITRA ORCUTTI Dali, 1920. 
Nautilus, vol. No. 3, p. 103. 
La Jolla, California. 
pi. 15, fig. 14, 1800. 
Genus VOLUTOMITRA Gray, 1857. 
VO LUTO MITRA ALASKAN A Dali, 1902. (Plate 11. fig. 3.) 
Nautilus, vol. 15, p. 103; Smithsonian Misc. Coll., vol. 48, p. 142. 1907. 
Pribilof Islands and southward. Ulf San Diego, California, in 822 fathoms. 
? Genus MITROMORPHA A. Adams, 1865. 
MITROMORPHA FILOSA Carpenter, 186^. 
Ann. IMag. Nat. Hist., ser. 3, vol. 15, p. 182; Proc. U. S. Nat. Mus., vol. 15, 
pi. 19, fig. 1, 1892. 
Monterey, California, to Gulf of California. 
MITROMORPHA ASPERA Carpenter, 186^. 
Journ. de Conchyl.. vol. 12, p. 146. — Teyon, Man., vol. C, pi. 25, fig. 61. 
Monterey to San Pedro, California. ^ 
MITROMORPHA GRACILIOR Hemphill, 1884. 
Teyon, Man. Couch, vol. 6, p. 317. pi. 25, fig. 62. ^ ^ , S J ^ /O J 
Forrester Island, Alaska, to San Diego, California. dj, a/-, 
MITROMORPHA GRACILIOR INTERMEDIA Arnold, 1903. 
l*al. San I^edro, p. 223, pi. 4, fig. 10. 
Santa Rosa Island. Also Pliocene of San Pedro and Pleistocene of Santa 
Barbara, California. 
Family FASCIOLARIIDAE. 
Genus PTYCHATRACTUS Stimpson, 1871. 
PTYCHATRACTUS OCCIDENTALIS Stearns, 1371. (Plate 6, fig. 8.) 
Conch. Memoranda, No. 7, p. 1 ; Proc. Cal. Acad. Sci., vol. 5, p. 79, 1873. 
Bering Island, Bering Sea, and eastward to the Shumagin Islands, Alaska. 
PTYCHATRACTUS CALIFORNICUS Ball, 1908. 
Bull. Mus. Comp. Zool., vol. 43, p. 299. 
Monterey Bay, and near San Diego, California, in 822 fathoms. 
