— 24 — 

 ADDITIONS TO TERTIARY AND QUATERNARY FOSSILS. 



Acmaea? instabilis Gould. 



U. S. Expl. Exp'd., Moll., p. 9. 

 Living — Straits of Fuca to Monterey. 

 Quat. — San Nicolas I. (Bowers). 



Amiantis callosa Conrad. 



Jour. Acad. Nat. Sc. Phil., vol. VII, 1837, p. 252. Keep, Common 



Sea Shells, 1881, pi. 14, f. 5. 



Living — Santa Barbara to Cape St. Lucas. 

 Quat. — Orange County (Bowers). 



Area ponderosa Say? 



Jour. Acad. Nat. Sc. Phil., vol. II, p. 267, 1822. 



Living — Southern U. S. Coast. 



PL — Same coast (and West Coast?). 



Oalliostoma supragranosum Carpenter. 



Moll, of W. North Amer. (1864), p. 139, 653. Carpenter, Proc. Cal. 



Acad. Sc, vol. Ill, p. 214, 1865. 



Living — Monterey to San Pedro? San Diego. 

 PL? — Ventura County (Bowers). 



Pterorhytis foliatus Martyn. 



Univ. Conchol., No. 66, pi. 24, f. 1, 1784. Keep, Common Shells. 



p. 21, pi. 3, f. 6. 



Living — Sitka to Santa Barbara. Asia. 



Quat. — San Joaquin Bay, Orange County (Bowers). 



Chama exogyra Conrad. 



Jour. Acad. Nat. Sciences, Philad., 1837, p. 256. 

 Living — Bodega Bay to San Diego. Mazatlan? 

 Quat. — Santa Barbara to San Pedro. San Nicolas Island (S. Bowers). 



Chama pellucida Sowerby. 



C. spinosa Broderip, var. 2. Proc. Zool. Soc. Lond., 1834, p. 150. 



Carp., Moll, of W. N. America, p. 641 (127). Keep, West Coast 



Shells, p. 182, f. 155. 



These two forms seem to intergrade, and are often hard to separate, 

 especially the fossil specimens. 



The former also runs into C. exogyra Con., which sometimes has 

 dextral and sinistral shells together in one group. Whether any of 

 them are identical with the tropical species of same names or not is 



