NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 25 
Section HALISTREPTA Dali, 1904. 
PERIPLOMA SULCATA Dali, 1904. 
Nautilus, vol. 17, No. 11, p. 122; Bull. Mus. Comp. Zool., vol. 43, No. 5, 
pi. 15, fig. 10. 
San Pedro Bay, Terminal Island, California. 
Family THRACIIDAE. 
Genus THRACIA (Leach) Blainville, 1824. 
THRACIA CURTA Conrad, 1837. 
Journ. Acad. Nat. Sci. Phila., vol. 7, p. 248, pi. 19, fig. 8. 
Arctic Ocean, Bering Sea, and south to San Diego, California. 
THRACIA BERINGI Dali, 1915. 
Proc. U. S. Nat. Mus., vol. 49, No. 2116, p. 442. 
Bering Sea, Aleutian Islands and southward to Sitka, Alaska. 
THRACIA CHALLISIANA Dali, 1915. 
Proc. U. S. Nat. Mus., vol. 49, No. 2116, p. 443. 
Forrester Island, Alaska, to Gulf of Georgia. 
THRACIA DIEGENSIS Dali, 1915. 
Proc. U. S. Nat. Mus., vol. 49, No. 2116, p. 443. 
San Pedro Bay, California, to Magdalena Bay. 
Genus CYATHODONTA Conrad, 1849. 
CYATHODONTA DUBIOSA Dali, 1915. 
Proc. U. S. Nat. Mus., vol. 49, No. 2116, p. 445. 
San Pedro to San Diego and the Gulf of California. 
CYATHODONTA PEDROANA Dali, 19lf 
Proc. U. S. Nat. Mus., vol. 49, No. 2116, p. 445. 
San Pedro Harbor and Catalina Island, California. 
Genus ASTHENOTHAERUS Carpenter, 1864. 
ASTHENOTHAERUS VILLOSIOR Carpenter, 1864. 
Ann. Mag. Nat. Hist., ser. 3 vol. 13, p. 311. 
San Pedro, California, to Cape San Lucas. 
B: ADELOSIPHONIA. 
Family PANDORIDAE. 
Genus PANDORA Hwass, 1795. 
Subgenus Kenneelia Carpenter, 1864. 
KENNERLIA GRANDIS Dali, 1877. 
Proc. Cal. Acad. Sci., vol. 7, p. 11. 
Pribilof Islands, Bering Sea, to Siletz Bay, Oregon. 
