4 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 65 



Genus SEPTIFER Rccluz, 1848. 



SEPTIFER BIFURCATUS (Conrad) Reeve, 1837, ten valves. 



Living. Crescent City, California-Gulf of California. 

 Genus MODIOLUS Lamarck, 1799. 



MODIOLUS MODIOLUS Linnaeus. 1858. part of one valve. 



Living on the west coast from tlie Arctic-San Pedro, California. 



MODIOLUS CAPAX Conrad. 1837, one valve. 



Living, Santa Barbara, California-Peru. 



Genus BOTULA Morch, 1853. 



Subgenus Adula H. and A. Adams, 1857. 



BOTULA FALCATA Gould, 1851, three specimens. 



Living, Coos Bay, Oregon-San Diego, California. 



Genus CRENELLA Brown, 1827. 



CRENELLA DECUSSATA Montagu, 1808, about 100 valves. 



Living, Bering Sea-San Pedro, California. 



Family THRACIIDAE. 



Genus CYATHODONTA Conrad, 1848. 



CYATHODONTA PEDROANA Dall, 1916, one valve and several pieces. 



Living, San Pedro and Catalina Island, California. 



Family LYONSIIDAE. 



Genus LYONSIA Turton, 1822. 



LYONSIA CALIFORNICA Conrad, 1837, plentiful. 

 Living, Puget Sound-Lower California. 



Genus MYTILIMERIA Conrad, 1837. 



MYTILIMERIA NUfTALLII Conrad, 1837, one valve. 



Living, Vancouver Island-San Diego, California. 



Family VERTICORDIIDAE. 

 Genus VERTICORDIA Wood, 1844. 



VERTICORDIA ORNATA Orbigny, 1846, three valves. 



Living, Catalina Island, California-Panama. 



Family CARDITIDAE. 



Genus CARDITA (Bruguiere) Lamarck, 1799. 



Section CARDITAMERA Conrad, 1838. 



CARDITA SUBQUADRATA Carpenter, 1865, about thirty valves. 

 Living, Queen Charlotte Islands-Lower California. 



