168 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
Superfamily DOCOGLOSSA. 
Family LEPETIDAE. 
Genus LEPETA Gray, 1847. 
Subgenus Ceyptoctenidta Dali, 1918. 
CRYPTOCTENIDIA CONCENTRICA Middendorff, 1851. 
Sibirische Reise, p. 183, pi. 16, fig. 6; Amer. Journ. Conch., vol. 5, pt. 3,. 
pi. 15, fig. 2. 
Icy Cape, Arctic Ocean, on the west to the Okhotsk Sea and Shantar Islands, 
on the east to Forrester Island, Alaska. 
CRYPTOCTENIDIA CAECOIDES Carpenter, 186^. 
Proc. Acad., Nat. Sci. Phila., p. 60. 
Arctic and Bering Seas to Hakodate, Japan, the Aleutian Islands, and 
south to the Farallones Islands, California. 
CRYPTOCTENIDIA ALBA Dali, 1869. 
Amer. Journ. Conch., vol. 5, pt. 3, p. 145, pi. 15, figs. 3 a-d. 
Bering Strait and sea south to Fuca Strait. 
CRYPTOCTENIDIA ALBA INSTABILIS Dali, 1869. 
Amer. Journ. Conch., vol., 5, pt. 3, p. 145, pi. 15, fig. 6. 
Unalashka to the Shumagins and south to Sitka Sound, Alaska. 
Family ACMAEIDAE. 
Genus ACMAEA Eschscholtz, 1830. 
(See Nautilus, June, 1914.) 
ACMAEA MITRA Eschscholtz, 1833. 
Zool. Atlas, p. 18, pi. 23, fig. 4; Amer. Journ. Conch., vol. 5, pi. 15, figs. 
5 a-c. 
Pribilof Islands, Bering Sea, to San Diego, California. 
ACMAEA MITRA FUNICULATA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 650. 
Shumagin Islands, Alaska, to Magdalena Bay, Lower California. 
Section COLLISELLA Dali, 1871. 
ACMAEA CASSIS Eschscholtz, 1833. 
Zool. Atlas, p. 19, pi. 24, fig. 3. 
Aleutian Islands to San Francisco, California. 
ACMAEA CASSIS PELTA Eschscholtz, 1833. 
Zool., Atlas, p. 10. — Tryon, Man., vol. 13, pi. 8, figs. 90, 91. 
Okhotsk and Southern Bering Sea, Nushagak, Alaska, the Aleutian Islands 
south to Rosario Bay, Lower California, and Socorro Island. 
ACMAEA CASSIS OLYMPICA Dall, 1914. 
Nautilus, vol. 28, No. 2, p. 14. — Tryon, Man., vol. 13, pi. 8. figs. 92-94. 
Alaska Peninsula south to San Diego, California. 
