PLATE YI. 



:\II()('KNK I'KCTKXS. 



[Hiiless otlicrwist; statt-'d all (ij^urirs arc :iii|inixiiiijtlrl>' iialnnil size.] 



Page. 



Fifi. 1. Pecten {Pirlcn) krepi n. sp. D. A. Typf <iO 



Kxterior of right valve; altituiie T") rain. Carrizn fonnalicni ( Miocene ), Carrizo Creek 

 (Ii,«triet, San Die^o County, Cal. (M. P.) 



Kio. 1((. Same specimen as fig. 1 liO 



I'rofile of right valve viewed from rear. (M. P.) 



Fi<i. 2. Peden (PaUnopectcn) cooxenxh Shumard. U. 8. X. M. 1(1771)1 til 



Exterior of left valve; altituile 10;5 mm. Emiiire formation (Mioi'ene), Coos Bay, Oreg. 

 (M. 1*.) 



156 



