8 PROCEEDINGS OF THE NATIONAL MUSEUM. vou 65 



Genus SANGUINOLARIA Lamarck, 1799. 



Section NTJTTALLIA Call, 1897. 



SANGUINOLARIA NUTTALLII Conrad, 1837. not rare. 



Living, San Pedro, California-Magdalena Bay, Lower California. 



Family SOLENIDAE. 



Genus SOLEN (Linnaeus) Scopoli, 1777. 



SOLEN SICARIUS Gould. 1850. four valves. 



Living, Vancouver Island-Lower Callfi>rnia. 



Family MACTRIDAE. 



Genus SPISULA Gray, 1838. 



Subgenus Symmorphomactra Dall, 1894. 



SPISULA PLANULATA Conrad, 1837, twelve valves. 



Living, Monterey-Cape San Lucas, Lower California. 

 Genus SCHIZOTHAERUS Conrad, 1853. 



SCHIZOTHAEKUS NUTTALLII Conrad. 1837. rare. 



Living, Alaska-San Diego, California, 



Family MYACIDAE. 



Genus CRYPTOMYA Conrad, 1849. 



CRYPTOMYA CALIFORNICA Conrad, 1837, plentiful. 



Living, Alaska-Mexico. 



Family SAXICAVIDAE. 



Genus SAXICAVA Fleuriau, 1802. 



SAXICAVA ARCTICA Linnaeus. 1767. two valves. 



Living, Alaska-Panama. Also Atlantic. 



Family PHOLADIDAE. 



Genus PHOLADIDEA Turton, 1848. 



PHOLADIDEA PENITA Conrad, 1837. plentiful. 



Living, Alaska-San Diego, California. 



Family TEREDIDAE. 



TEREDO TUBES, species indeterminable. 



Family DENTALIIDAE. 



Genus DENTALIUM Linnaeus, 1758. 



DENTALIUM NEOHEXAGONUM Sharp and Pilsbry. 1897. not rare. 



Living, Monterey, California-Central America. 



DENTALIUM PRETIOSUM Sowerby. 1860, not rare. 



Living, Forrester Island, Alaska-San Diego, Calif. 



