NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 37 
Genus ROCHEFORTIA Velain, 1846. 
ROCHEFORTIA TUMIDA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 129 ; Proc. U. S. Nat. Mus., vol. 21, p. 892, pi. 
87, fig. 7. ' c ' / 
Shumagin Islands, Alaska, to San Diego, California. 
ROCHEFORTIA PLANATA Dali, 1885. 
Arch. f. Naturg, vol. 51, p. 34, pi. 3, fig. 6; Proc. U. S. Nat. Mus., vol. 21, 
p. 892, pi. 88, fig. 12, 1899. 
Icy Cape, Arctic Ocean, south to the Shumagin Islands, Alaska. 
ROCHEFORTIA FERRUGINOSA Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, p. 411. 
San Francisco Bay to Santa Rosa Island, California. 
ROCHEFORTIA BERINGENSIS Dall, 1916. 
Proc. U. S. Nat. Mus., vol. 52, p. 411. 
Bering Island, Bering Sea. 
ROCHEFORTIA GREBNITZSKII Dall, 1916. 
Proc. U. S. Nat. Mus., vol. 52, p. 411. 
Bering Island, Bering Sea. 
ROCHEFORTIA ALEUTICA Dall, 1899. 
Proc. U. S. Nat. Mus., vol. 21, p. 892, pi. 87, fig. 6. 
Bering Sea to Coronado Islands. 
ROCHEFORTIA COMPRESSA Dall, 19l/. (Plate 3, fig. 14 
Proc. U. S. Nat. Mus., vol. 45, No. 2002, p. 596. 
Shumagin Islands, Alaska, to Gulf of California. 
ROCHEFORTIA PEDROANA Dall, 1899. 
Proc. U. S. Nat. Mus., vol. 21, p. 893, pi. 88, fig. 4. 
San Pedro, California. 
ROCHEFORTIA GRIPPI Dall, 1912. 
Nautilus, vol. 25, No. 11, p. 128. 
San Diego, California. 
ROCHEFORTIA GOLISCHI Dall, 1916. 
Proc. U. S. Nat. Mus., vol. 52, p. 411. 
Off Santa Rosa Islands, California. 
Genus SERRIDENS Dall, 1899. 
SERRIDENS OBLONGA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 643 ; Proc. Cal. Acad. Sci., vol. 3, p. 210. 
San Pedro to Coronado Islands. S, 
Genus PSEUDOPYTHINA Fischer, 1884. 
PSEUDOPYTHINA RUGIFERA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 643. — Whiteaves, Rep. Progress, Geol. Surv. 
Canada, 1880, p. 198 B, fig. 2. 
Commensal with Gebia. Puget Sound. 
