ARNOLD — THE PALEONTOLOGY AND STKATIOKAPHY OF SAN PEDHO. 307 



Coiniiioii in the lower San Pedro series of Deadniaii I.slaiul, and in u|)per San 

 I'l'dro series of Deadmaii Island, San Pedro, Los Cerritos, Long Beach, and Crawfish 

 George's. Found in tlie Pleistocene at Twenty-sixth Street and Pacific J>cach, 

 San Dieji;o. 



Living. — Monterey to San Diego (Carpenter): south to Peru (Cooper). 



Pleistocene. — Santa Barbara (C-ooper): San Pedro; San Diego (Arnold). 



Pliocene. — San Diego well (Dall): Caloosahatchie beds and Allifi;ator Creek, 

 Florida (Dall and WiUcox). 



Miocene. — (Xewcr) North and South Cainiina (Coni'ad and Holmes): (older) 

 San Domingo (Gabb). 



Genus Galerus Hamphrey. 



Shell depressed, subconical, spiral; summit subcentral; aperture very large, basal, with a 

 subspiral broad lamina adhering to tlie left margin. 



Galerus chinensis Linn, is a characteristic species. 



342. Galerus mammillaris Broderip. 



Galerus mammillaris Brod., Trans. Zool. Soc, 1835, PI. XXIII, tig. 5. Cpr., Brit. Assn. Rept., 

 1856, p. 323. =Calyplrea fastigiala Gld., = (?) Galerus contortus Cpr. {fide Dall, 

 Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 203). 



Calyplrea mammillaris Brot:)., Tryon, Man. Conch., Vol. VIII, p. 120, PI. XXXIV, figs. 64-75, 

 78-81, 1 886. 



Shell depressed, subconical; whorls flattened, three; apex central, blunt; aperture subcircular, 

 large; a broad lamina begins at ape.x on inner surface and makes a whole turn to the left, reaching 

 nearly to margin; lower part of body-whorl corrugated; surface marked by irregular spiral stria;. 



Dimensions. — Long. 32 mm.; lat. 30 mm.; alt. 7 mm. 



The specimen described was identified by Dr. Dall. 



Rare in lower San Pedro series of Deadraan Island and San Pedro; and in 

 the upper San Pedro series at Crawfish George's and San Pedro. 



Living. — Puget Sound to Monterey (Cooper): Santa Barbara to Central 

 America (Carpenter): San Pedro (Williamson). 



Pleistocene. — San Pedro (Arnold). 



Pliocene. — San Diego well (Dall). 



Genus Crepidula Lamarck. 



Shell oval, limpet-like, with a posterior, generally lateral spiral apex; interior with a shelly 

 lamina covering its posterior half. 



Crepidula peruviana Lam. is a characteristic species. 



