118 I ALll'OKNMA Ai'ADKMV I H' Sl'IKNCKS. 



ami San Pedro. Foiiml also in ilir IMeistocone al Harlow's ranch, Vonluni, and in 

 tin' IMoistocem- of Spanisli Hiirjit nnd P;u'ilic Boacli, Sm Dieeo. 



lAriui/. — Moiitoivy to Mexico (Cooper). 



Pleistocene. — San Pedro (Cooper ; Arnold): Ventnra; San Diego (ArnnM ). 



[S. |).) Anomia limatula J),ill. 



.■Inoniia limatula Dali., I'roc. U. S. Nat. Miis., Vol. I, 1879, p. 15. Trans. Warner Inst. Sci., Vol. 

 Ill, Part 4, 1898, p. 7S5, PI. XXXV. fiR. 19. 



Shell lar^o, thin, irregular, with a rather thickened hinge-line; e.xternal surface rough, like 

 ln'sh Iractmed china-ware: surface tlevoid of all norm.il radial sculpture, and still retaining on its 

 yellowish valves traces of dark |)urple, irregularly radial blotches. The calcareous i)lng of this 

 species is peculiar, being hollow, and the cylinder incomplete on one side. 



Di.stingni.sliable from .1. /'/////«■ and Pododesmna macroschismn by its lack of 

 radial scidpturc. Reported in the Pleistocene of San Pedro by Stearns. 



Plehtocenb. — San Pedro (Stearns): Ventura Connty, eight miles inland and 

 two hnndred feet elevation above sea-lev(d (Bowers): Spanish Bight and Coronado 

 Beach, San Diego (Hemphill; Stearns): Twentv-sixth Street, San J)iego (Hemphill; 

 Arnold). 



Superf.imily >n'TlT,ACEA. 



Family Xli. MYTILID/E. 



Genus Mytilus {lAnne) Bolten. 



Shell wedge-shaped, rounded behind; umbones terminal, pointed ; hinge-teeth minute or 

 obsolete; pedal muscular impressions two in each valve, small, simjilc, close to the adductors. 



Mytilus smnragdinua Cheran. is a characteristic species. 



Section M//lilux .s. .s. 

 Surface with chiefly concentric sculpture, or smooth. 

 Type, jMijtilufi rdnllA Tjinm'. 



40. Mytilus edulis Linne. 



Mytilus edulis LiNX., Syst. Nat., Ed. X, 1758, p. 705. = M. borealis Lam. == M. abbreviatns Lam. 



= M. vetustus Lam. = M. incurvams Lam. == M. pellucidus Pennant = M. notalus 



DeKav = M. subsaxatilis Williamson {Jide Carpenter, Brit. Assn. Rept. , 1856, p. 



219). Carpenter, Brit. Assn. Rept., 1863. p. 643. Cooper, 7th Ann. Rept. Cal. St. 



Min., 1888, p. 252. Keep, West Coast Shells, p. 173, 1892. Williamson, Proc. 



U. S. Nat. Mus., Vol.XV, 1892, p. 191. = Modiola ptilex H. C. Lea (not of Lam.) 



= Mytilus minganensis Mighels, &c. {fide Dall, Wagner Inst. Sci., Vol. Ill, Part 4, 



1898, p. 788). 

 Mytilus pcdroavus CoN., Pac. R. R. Rept., Vol. V, 1853. p. 325, PI. V, fig. 40. 



