PLATE XIV. 



MIOCENK PF>CTENS. 



[Unless ntluTwist- staird all tigurus arc approxiiiialch- natural size.) 



Page 



Fig. 1. I'ciiot ( 1. II ri 1 1 Ill-tin) jii'ri-iiii n. k|i. !>. S. J. U. T_vj)e )S0 



Extt'i'ior (if iiiiporfect right valve; altitude 150 nun. Vacjuems sandstone (Miocene), 

 between Morro and Tnro creeks, Sau Luis Obispo County, Cal. [M. P..) 



Fid. l'(. Same specimen as fip;. 1 SO 



Profile of both valves viewed from rear. (M. P.) 



ITli 



