PLATE YTTT. 



MIOCENE AND PLIOCENE PEtTENS. 



[Unless otherwise stated all figures are ajiprDxiniately natural size.] 



Page. 



Fiti. 1. Pecte)! (I'atiiKijndoi) 'iiirril n. fp. V. C. Type - (;3 



Extt'i-ior of ri^'lit valve, iiiitoriiir ear slightly broken; altitude s."i mm. (Upper Mio- 

 cene'.'), Foxiii'.s ranch, Santa Barbara Oounty, Cal. (M. B.) 



Fiii. la. Same .'specimen at* tig. 1 63 



Exterior of left valve. (M. P..) 



Fig. 1/*. Sauie specimen a.'^ lig. 1 63 



Profile of both valve.s viewed from rear. (:\I. P.) 



Fig. 2. I'eHeu ( ( 'likimi/s ) xi'spcoixis n. ^p. C. S. :M. B 69 



Portion of mold of interior of right valve; altitude .50 mm. Va(jueros formation (lower 

 Miocene), Sespe Canyon, Ventura County, Cal. (M. B. ) 



Fig. 2(1. Same s^pecimen as tig. 2 69 



Portion of mold of interior of left valve. 



Fig. 3. Pecten (< 'Iildiniix) .vx/iei'iiKin n. i^p. C. S. M. B. Plastotype 69 



Cast of exterior of .^lightly injperfect left valve (young); altitude IS mm. Same locality 

 as fig. 2. (M. B.) 



160 



