NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 87 



ATRIMITRA? LOWEI Dall, 1903. (Plate 15, fig. 4.) 



Proc. Biol. Soc. Wash., 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. 



Panama Shells, p. 44 ; Proc. U. S. Nat. Mus., vol. 13, pi. 15, fig. 14, 1890. 

 Point Lonia, California, to Panama. 



MITRA ORCUTTI Dall. 1920. 



Nautilus, vol. 23, No. 3, p. 103. 

 La Jolla, California. 



Genus VOLUTOMITRA Gray, 1857. 



VOLUTO MITRA ALASKAN A Dall, 1902. (Plate 11. fig. 3.) 



Nautilus, vol. 15, p. 103; Smithsonian Misc. Coll., vol. 48, p. 142. 1907. 

 Pribilof Islands and southward. Off San Diego, California, in 822 fathoms. 



? Genus MITROMORPHA A. Adams, 1865. 



MITROMORPHA FILOSA Carpenter. 1865. 



Ann. Mag. Nat. Hist., ser. 3, vol. 15, p. 182; Proc. U. S. Nat. Mus., vol. 15, 



pi. 19, fig. 1, 1S92. 

 Monterey, California, to Gulf of California. 



MITROMORPHA ASPERA Carpenter, 1865. 



Journ. de Conchyl., vol. 12, p. 146. — Tkyon, Man., vol. 6, pi. 25, fig. 61. 

 Monterey to San Pedro, California. 



MITROMORPHA GRACILIOR Hemphill, 1884. 



Tryon, Man. Conch, vol. 0, p. 317. pi. 25, fig. 62. 

 Forrester Island, Alaska, to San Diego, California. 



MITROMORPHA GRACILIOR INTERMEDIA Arnold, 1903. 

 Pal. San Pedro, p. 223, pi. 4, fig. 10. 



Santa Kosa Island. Also Pliocene of San Pedro and Pleistocene of Santa 

 Barbara, California. 



Family FASCIOLARIIDAE. 

 Genus PTYCHATRACTUS Stimpson, 1871. 



PTYCHATRACTUS OCCIDENTALIS Stearns, 1871. (Plate 6, fig. 8.) 



Conch. Memoranda, No. 7, p. 1 ; Proc. Cal. Acad. Sci., vol. 5, p. 71). 1873. 

 Bering Island, Bering Sea, and eastward to the Shumagin Islands, Alaska. 



PTYCHATRACTUS CALIFORNICUS Dall, 1908. 



Bull. Mus. Comp. Zool., vol. 43, p. 299. 



Monterey Bay, and near San Diego, California, in 822 fathoms. 



