32 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
VENERICARDIA CRASSIDENS Broderip and Sowerby, 1829. 
Zool. Journ., vol. 4, p. 365 ; Proc. U. S. Nat. Mus., vol. 26, p. 949, pi. 43, fi^. 9. 
Arctic and Bering Seas and eastward to Kodiak Island, Alaska. 
VENERICARDIA NODULOSA Dali, 1919. 
Proc. Biol. Soc. Wash., vol. 32, p. 249. 
Santa Barbara to the Coronado Islands. 
VENERICARDIA MONILICOSTA Gabb, 1861. 
Proc. Acad. Nat. Sci. Phila., p. 371. 
Santa Barbara, Pleistocene. Recent? 
VENERICARDIA VENTRICOSA Gould, 1850. 
Proc. Boston Soc. Nat. Hist., vol. 3, p. 276; Rep. U. S. Expl. Exp. Moll., 
p. 417, fig. 532. 
Belkoffski Bay, Alaska, to Coronado Islands and Cortez Bank, California. 
VENERICARDIA INCISA Dali, 1902. 
Proc. Acad. Nat. Sci. Phila., pp. 710, 714; Proc. U. S. Nat. Mus., vol. 26, 
No. 1342, pi. 63, fig. 4. 
Unala«ka to the Semidi Islands, Alaska. 
Siibgenus Miodontiscus Dali, 1903. 
MIODONTISCUS PROLONGATUS Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 642; Proc. U. S. Nat. Mus.. vol. 13, pi. 16, 
figs. 7, 9. • 
Middleton Island, Alaska, to San Diego, California. 
MIODONTISCUS MERIDIONALIS Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 408. 
Off Point Loma, California, 70 fathoms. 
Genus CALYPTOGENA Dali, 1891. 
CALYPTOGENA PACIFICA Dali, 1891. 
Proc. U. S. Nat. Mus., vol. 14, p. 190; vol. 17, pi. 25, figs. 4, 5. 
Clarence Strait, Alaska, to Santa Barbara Channel, California. 
CALYPTOGENA ELONGATA Dali, 1916. <Plate 3, fig. 3.) 
Proc. U. S. Nat. Mus., vol. .52, No. 2183, p. 408. 
Santa Barbara Islands to San Diego. 
Genus MILNERIA Dali, 1881. 
MILNERIA MINIMA Dali, 1871. 
Amer. Journ. Conch., vol. 7, p. 152, pi. 16, figs. 5, 6. 
Monterey to Rosario Bay, Lower California, on Haliotis. 
MILNERIA KELSEYI Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 408; vol. 8, pi. 25, figs. 4, 7. 
Monterey to Point Abreojos, Lower California, under stones. 
