P I. A T E X X 1 T . 



MIOCKXE PECTENS. 



[riiU'>s otluTwisi' slalud all ligurus aru apprDXiniatt'ly iialiinil sizo-l 



fage. 



Fiii. 1. I'cclcii { fj/roiH'Clni) ////(/"ci'gfi.t/.v ii. sp. V. 0. Ty|ic' 711 



Exterior of somewhat, iiiiperfect riirlit valve; altitiKle IK) iiiiii. Jlioeene (lower), 8an 

 Miguel Inland, Sania I'.ailiara County, Cal. (M. B.) 



Fig. la. Same specimen as liji. 1 79 



Exterior of somrulial ini|nMleet left valve. (M. R. ) 



Fig. lb. Same specimen as li-j;. I 79 



Somewhat distorti'il profile of Ijoth valves view'ed from rear. (M. P.) 



188 



