NOKTHWEST COAST MAKINE SHELLBEARING MOLLUSKS. 169 
ACMAEA cassis NACELLOIDES Dali, 1871. 
Amer. Joiirn. Conch., vol. 6, p. 247, pi. 17, figs. 36 a-c. 
Attn Island, Aleutians, east and south to San Diego, California, on kelp. 
ACMAEA CASSIS MONTICOLA Carpenter, 1866. 
Amer. Journ, Conch., vol. 2, p. 337. 
Monterey, California. 
ACMAEA SCUTUM Eschscholtz, 1833. 
Zool. Atlas, pt. 5, p. 19, pi. 23, figs., 1-3. 
Southern Bering Sea to Tugur Bay and the Shantar Islands on the west, 
and from the Pribilof and Aleutian Islands on the east south to the 
Gulf of California and Socorro Island. 
ACMAEA SCUTUM PATINA Eschscholtz, 1833. 
Zool. Atlas, pt. 5, p. 19, pi. 24, figs. 7, 8. 
Same distribution as the typical form. 
ACMAEA SCUTUM PINTADINA Gould, 1846. 
Proc. Boston Soc. Nat., Hist., vol. 2, p. 151. — Tryon, Man., vol. 13, pi. 9, 
fig. 6. 
Aleutian Islands to Monterey, California. 
ACMAEA SCUTUM CRIERARIA Carpenter, 1866. 
Amer. Journ. Conch., vol. 2, p. 335. 
Neah Bay, Washington, to Santa Barbara, California. 
ACMAEA SCUTUM OCHRACEA Dali, 1871. 
Amer. Journ. Conch., vol 6, p. 249, pi. 17, fig. 35. 
Monterey, California. 
ACMAEA SCUTUM PARALLELA Dali, 1914. 
Nautilus, vol. 28, No. 2, p. 14; Amer. Journ., Conch., vol. 6, p. 250, pi. 14. 
fig. 13. 
Sitka, Alaska, to Victoria, British Columbia, on eel grass. 
ACMAEA EMYDIA Dali, 1914. 
Nautilus, vol. 28, No. 2, p. 14 ; Amer. Journ. Conch., vol. 6, p. 250, ex parte. 
Arctic Ocean and Northern Bering Sea to Nushagak, Alaska, the Pribilof 
Islands, and Attu Island. 
ACMAEA PERAMABILIS Dali, 1872. 
Proc. Cal. Acad. Sci., vol. 4, p. 302. — ^Tryon, Man., vol. 13, pi. 33, figs. 
80-82. 
Shumagin Islands, Alaska, on granite rocks only. 
ACMAEA DIGITALIS Eschscholtz, 1833. 
Zool. Atlas, vol. 5, p. 20, pi. 23, figs. 7, 8. 
Aleutian Islands to Monterey, California. 
ACMAEA DIGITALIS UMBONATA Reeve, 1855. 
Conch. Icon., Patella, fig. 107. 
Saginaw Bay, Alaska. 
ACMAEA DIGITALIS TEXTILIS Gould, 1846. 
Proc. Boston Soc. Nat. Hist., vol. 2, p. 152 ; Rep. U. S. Expl. Exp., Moll., 
pi. 29, fig. 456. 
Tillamook, Oregon, south to Socorro Island. 
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