— 29 — 

 Muricidea subangulata Stearns. 



Proc. Cal. Acad. Sciences, vol. V, p. 81, pi. 1, f. 4, 1873. 

 Living — San Miguel Island, Santa Barbara County (W. G. W. Har- 

 ford). 



Quat. — San Nicolas Island, Ventura County (S. Bowers). 



My a arenaria Linne. 



Syst. Nat., p. 1112. Dall, Shells of S.E. Coast of U. S., 3 figures. 



Living — Circumboreal; south to England, South Carolina, Sitka, 

 Japan. Naturalized in San Francisco Bay. 



PI. — San Joaquin Valley. Not on coast nor in Quaternary beds. 

 Specimens of this familiar species have long been suspected to occur in 

 the valley, but only in 1893 was their identity established by many 

 perfect specimens brought by Mr. Watts from west of Tulare Lake. 

 Their absence from the Quaternary along the coast, and the cause of 

 their extinction at present between San Joaquin Valley and Sitka, 

 while they have increased enormously in San Francisco Bay since re- 

 introduction in 1869, are problems which deserve thorough investigation. 

 Not the slightest specific difierence exists between these fossils and recent 

 specimens from San Francisco Bay, Eastern U. S., and England. 



Nassa californiana Conrad. 



Schizopyga californiana Con. Proc. Acad. Nat. Sc. Phil., 1850, p. 



315-; Pacif. R. Pv. Rep., VI, p. 69, pi. 2, f. 1, 1857. Dall, Proc. U. S. 



Nat. Mus., 1891, p. 177 (Nassa). N.fossata var., Gabb, Pal. of Cal., vol. 

 II, p. 47, 74, 1869, and of authors. 



Living — Drake's Bay to Cedros Is., Lower Calif., in 25-65 fms. U. S. 

 FishComm. (Dall). 



PL? — Dead Man's I., San Pedro, and Los Angeles City (Miss Monks, 

 Mrs. Williamson, etc.). 



Mioc. — Sta. Clara County, and other localities. Mr. Dall separates 

 this from N. fossata as the " ancestor," although it is also found living, 

 and is more probably a deep-water form connected by intergrades. 

 They were combined as N.fossata in Pal. of Cal., vol. II. 



Natica russa Gould. 



Proc. Bost. Soc. Nat. Hist., 1859, Expedition Shells. Otia, p. 109, 



1862. Carp., Moll, of West Amer., 1863, p. 586 (72). 



Living — Arctic Ocean, Pacific side (Stimpson). 



Quati — Sta. Barbara (S. Bowers). Separated by Dall from N. clausa, 

 as given by Gabb in Pal. of Calif., p. 77. 



