NOKTHWEST COAST MARINE SHELLBEAKING MOLLUSKS. 43 
Section CALLITHACA Dali, 1902. 
PROTOTHACA TENERRIMA Carpenter, 1856. 
Proc. Zool. Soc., p. 200; Univ. Cal. Zool. Publ., vol. 14, p. 272, pi. 22. 
Puget Sound to San Quentin Bay, Lower California. 
Section PROTOTHACA s. s. 
PROTOTHACA STAMINEA Conrad, 1837. 
Journ. Acad. Nat. Sci. Pliila., vol. 7, p. 250, pi. 19, fig. 15. 
Commander and Aleutian Islands, to Kamchatka and North Japan, and to 
Puget Sound and Socorro Island. 
PROTOTHACA STAMINEA STAMINEA Conrad, 1837. 
Journ. Acad. Nat. Sci. Phila., vol. 7, p. 250, pi. 19, fig. 15. 
Crescent City, California, to Socorro Island. 
PROTOTHACA STAMINEA RUDERATA Deshayes, 1853. 
Cat. Conch. Brit. Mus., vol. 1, p. l30. 
Southern Bering Sea to Lobitas, California. _ 
PROTOTHACA STAMINEA PETITII Deshayes, 1839. 
Revue Zool. Soc. Cuvierienne, p. 359. — Guekin, Mag. de Zool. Moll., 1841, 
pi. 39. 
Aleutian Islands to San Quentin Bay, Lower California. 
PROTOTHACA STAMINEA LACINIATA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 641; Journ. de Conchyl., vol. 12, p. 136. — Arnold, 
Pal. San Pedro, pi. 14, fig. 5. 
Unalaska, Alaska, to San Diego, California. 
PROTOTHACA STAMINEA ORBELLA Carpenter, 1864. 
Suppl. Rep. Brit. Soc., p. 641; Univ. Cal. Zool. Publ., vol. 14, p. 271, pi. 
19, fig. 6. 
Kodiak Island, Alaska, to San Diego, California. 
PROTOTHACA STAMINEA SPATIOSA Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, p. 413. 
Puget Sound to Anaheim Bay, California. 
PROTOTHACA GRATA Say, 1831. 
Amer. Conch., vol. 3, pi. 26« 
San Pedro (Williamson). Gulf of California to Panama. CiixAn., 
Genus LIOCYMA Dali, 1870. 
LIOCYMA BECKII Dali, 1870. 
Proc. Boston Soc. Nat. Hist., vol. 13, p. 257; Amer. Journ. Conch., vol. 7, 
p. 145, pi. 14, fig. 7. 
Plover Bay to North Japan, on 'the east to Port Althorp, Alaska. 
LIOCYMA SCAMMONI Dali, 1871. 
Amer. Journ. Conch., vol. 7, p. 145, pi. 14, fig. 9. 
Port Simpson, British Columbia. 
LIOCYMA VIRIDIS Dali, 1871. 
Amer. Journ. Conch., vol. 7, p. 146, pi. 14, fig. 8. 
Arctic Sea southward to North Japan, and on the east to the Kodiak 
Islands, Alaska. 
