NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 17 



SCAPHARCA (CORPULENTA Smith, 1885. variety ?) POMPHOLYX Dall. 1908. 

 Bull. Mus. Gomp. Zool., vol. 43, p. 398. 



Off Santa Barbara, California, to the Galapagos Islands and Mid-Pacific, 

 in deep water. 



Superfamily PTERIACEA. 



Family PINNIDAE. 

 Genus ATRINA (Gray) Adams, 1857. 



ATRINA OLDROYDI Dall, 1901. (Plate 2, figs. 4, 5, 6.) 



Nautilus, vol. 24, No. 12, p. 143. 



Off San Pedro, California, in 25 fathoms. 



Family PTERIIDAE. 

 Genus PTERIA Scopoli, 1777. 



PTERIA VIR1DOZONA Dall. 1916. 

 . Proc. U. S. Nat. Mus., vol. 52, No, 2183, p. 403. 

 Long Beach, California (Lowe). 



PTERIA STERNA Gould, 1851. 



Proc. Boston Soc. Nat. Hist, 1851, p. 93 ; Mex. and Cal. Shells, p. 31, pi. 16, 



fig. 7. 

 San Diego to Panama. 



Genus PEDALION Solander, 1770. 



PEDALION CHEMNITZIANUM Orbigny, 1845. 



Moll. Cuba, vol. 2, p. 346 ; Cortch. Cab., vol. 7, p. 250. pi. 59, fig. 580. 

 Coronado Islands to Panama and Chile. Also Atlantic. 



? Family PHILOBRYIDAE. 

 Genus PHILOBRYA Carpenter, 1872. 



PHILOBRYA SETOSA Carpenter, 1864. 



Ann. Mag. Nat. Hist., ser. 3, vol. 13, p. 314; Journ. de Conchyl.. vol. 45, 



p. 10, text figs. 1, 4 ; pi. 1, fig. 1. 

 Forrester Island, Alaska, to Gulf of California. 



Superfamily OSTRACEA. 



Family OSTREIDAE. 



Genus OSTREA Linnaeus, 1758. 



OSTREA VEATCHII Gabb, 1866. 



Pal. Cal., vol. 2, p. 34, pi. 11, fig. 59. 



Fossil at San Diego, living in the Gulf of California. 



