NOKTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 197 
PLACIPHORELLA RUFA Berry, 1917. 
Proc. Cal. Acad. Sci., ser. 4, vol. 7, p. 241, text figs. 3, 4. 
Forrfester Island, Alaska. 
PLACIPHORELLA STIMPSONI Gould, 1859. 
Proc. Boston Soc. Nat. Hist., vol. 7, p. 165. — Pilsbky, Man., vol. 14, pi. 62, 
figs. 84-87. 
On the west from Bering Island to Hakodate, Japan. On the east and south 
to Cerros Island, Lower California. 
PLACIPHORELLA PACIFICA Berry, 1919. 
Lorquinia, Jan., 1919, p. 6. 
Kaylsaan Bay, Alaska, 95 to 98 fathoms. (S. S. Berry.) 
Family ACANTHOCHITONIDAE. 
Germs ACANTHOCHITONA Gray, 1821. 
ACANTHOCHITONA AVICULA Carpenter, 1866. ^ 
Proc. Cal. Acad. Sci., vol. 3, p. 211. — Pilsuey, Man., vol. 15, p. 24. 
Catalina Island, California, to Gulf of California. 
ACANTHOCHITONA DIEGOENSIS Pilsbry, 1893. 
Man., vol. 15, p. 25, pi. 12, figs. 52-54. 
Catalina Island and Newport to San Diego, California. 
Genus KATHyRINA Gray, 1847. 
KATHlpRINA TUNICATA Wood, 1815. 
General Conch., p. 11, pi. 2, fig. 1 . — Pilsbky, Man., vol. 15, p. 41, pi. 1, 
figs. 1-11. 
Western and southern Bering Sea, to Cooks Inlet, Alaska, and south to 
Catalina Island, California. 
Family CRYPTOCHITONIDAE. 
Genus CRYPTOCHITON Gray-, 1847. 
CRYPTOCHITON STELLERI Middendorff, 1846. 
Bull. Acad. Sci^St. Petersburg, vol. 6, p. 116; Mai. Rossica, vol. 1, p. 93, 
pi. 1-9. 
On the west: Bering Island, Kamchatka, the Kuril Islands, and Okhotsk 
Sea, and south to Plakodate, Japan. On the east, the Aleutian Islands, 
Cooks Inlet and southward to San Miguel and San Nicolas Islands, 
California. 
Genus CHLAMYDOCHITON Dali, 1878. 
CHLAMYDOCHITON AMICULATUS Pallas, 1786. 
Nova Acta Acad. Petrop., vol. 2, p. 235, pi. 7, figs. 26-30. 
Kuril Islands and Northern Japan on the west, and to the Farallones 
Islands, California (Newcomb), on the east. 
