NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 25 



Section HALISTREPTA Dall, 1904. 

 PERIPLOMA SULCATA Dall, 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 Dall, 1915. 



Proc. U. S. Nat. Mus., vol. 49, No. 2116, p. 442. 



Bering Sea, Aleutian Islands and southward to Sitka, Alaska. 



THRACIA CHALLISIANA Dall, 1915. 



Proc. U. S. Nat. Mus.. vol. 49, No. 2116. p. 443. 

 Forrester Island, Alaska, to Gulf of Georgia. 



THRACIA DIEGENSIS Dall, 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 Dall, 1915. 



Proc. U. S. Nat. Mus., vol. 49, No. 2116, p. 445. 

 San Pedro to San Diego and the Gulf of California. 



CYATHODONTA PEDROANA Dall, 1916. 



Proc. U. S. Nat. Mus., vol. 49, No. 2116, p. 445. 

 San Pedro Harhor and Catalina Island, California. 



Genus ASTHENOTHAERUS Carpenter, 1864. 



ASTHENOTHAERUS VILLOSIOR Carpenter, 1884. 

 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 Kennerlia Carpenter, 1S64. 



KENNERLIA GRANDIS Dall. 1877. 



Proc. Cal. Acad. Sci., vol. 7, p. 11. 



Pribilof Islands, Bering Sea, to Siletz Bay, Oregon. 



