P T. A ^1^ K X T. 



MIOCENK PECTENS. 



[Unless (ithiTwisc shiti-il Jill li^lirt-s an.' aliproxlinntcly imtural size-.] 



Page. 



Fk;. 1. Pcrlen (Liiroprclen ) inrriui n. s|i, L. S. .1. I'. Ty])e ^0 



Exterior of imperfect left valve; iiltitmlc 150 nun. Va(|neros sandstone (Miocene), 

 between Morro and Tciro creeks, San l.nis Oliispo Cimnty, (.'al. (M. B. ) 

 Kiii. L'. Perten {Plai/iodeiiimn) naihciixix n. s|. I". S. N. yi. :^'.)\2. Type H7 



Exterior of imperfect rifrlit valve; Icimitudc 411 nnu. Miocene, Strait of Fuca, east of 

 Xeah Bay, Clallam County, Wash. (M. B. ) 

 Fui. 2(r. Same specimen as lii;. - - 87 



Exterior of imperfect left valve. ( .M. B.) 

 Fi<;. 2/). Same specimen as ti";. '2 ^7 



View of both valves from the rear. (M. B. ) 



174 



