P LA'r K X X I X, 



MIOCKNK. P1>I()('KXK, AMI (^lATl-.KN \ U V I'lsCTKNS. 



[Ciih-s i.tliiTwisL' statoii iill li^'iiivs iiri' a|i|)nixim;iti-ly iiMliinil si/cj 



Paffc 



Imii. 1. P.clni ( lliiiiill.'s) ulijiiutciix (iray. V. S. N. M. i:«:!(i !):{ 



Kxtcrior nf the Irit valve of tlic type nf Ciiiirad's Jliiiiilti'x criixsii: altitmle 111) iiiiii. 

 Santa Mar.t.'ai-ita I'nriuatiiiu iuii|pcr Miocene), Santa MarLrarita, San l.uis ()l)is|«i Connty, 

 Cal. (M. 1!.| 



Kid. :i. /V(7,7) { l/iiiiiifr.t) (/i(j((nlrm Gray. T. S. X. M. 741(3(3 ii:> 



Kxterior of ri;jht valve; altitude 7ll nun. I\ecent, San l)ie,u:n, Cal. ( M. B.1 



Fi(i. i!'(. Same speeimen as ti;;. -' - '••! 



Exterini- nf left valve. (M. U. ) 



