P L A T K X r . 



MIOCENK AND I'l.KK'KNK I'KCTFNS. 



[Uiilrss dlliiTwist' stiite'l all ti^iircs arv fippriixiiiiiituly natural size.] 



Patre. 



Fig. 1. I'erlni {Cliliiiiiii^) iciilt.^l u. ^it. C. A. S. Tyi.c 120 



Extfricir ni sliu'litly imperfect left valve; altitude (ili iiiii]. Ldwer I'linceiu-, Kreyeiilia- 

 f^eii's i-aucli, Fi'esno tViiiiity, Cal. (S. ) 



Fig. la. Same specimen as litr. 1 1-0 



Profile of left valve, viewed finm ro-ar. ( M. 1*. ) 



Fig. 2. Fecten ( Chliimi/s) hniiillin n. S|.. V. S. N. M. 1IUS44, Type 67 



Exterior of contorted (lenj^thened) right valve; altitude -"iH mm. Miocene (lower?), 

 head of Slacks Canyon, Monterey County, Cal. (M. B.) 



Fl(i. 3. J't'rten (('hliiiiiii.-<) KUlliri n. f\). D. A. Type 07 



Exterior of slightly imperfect ri^rht valve; altitude 74 mm. I'urisima formaticiii (lower 

 Pliocene), south of mouth of San Gregorio C'reek, San Mateo County, Cal. (M. B. ) 



Fig. 4. IWWii (clilKmiix) vntteri u. S]>. C. S. M. B. 1412.'). Cotype 07 



Exterior of slightly imperfect left valve; altitude Ki mm. Lower Pliocene, Kreyenha- 

 gen's ranch, Fresno County, Cal. (M. B. ) 



Fig. 4(1. Same specimen as fig. 4 07 



Profile of left valve, viewed from rear. 

 Fiii. 5. Pccleu (Ijijrdjxvtcii) crassicardo Conrad var. hdnii/loiii n. var. V. S. N. M. 16484.5. Type. 73 

 Exterior of slightly contorted and imperfect right valve; altitude 40 nun. Miocene, 

 Alum Kiick Canyon, Santa Clara County, Cal. 

 Fig. 0. I'ectoi {Li/i-n/ieclni) crmsica rdo Conrad var. Ii<iiiiill(iiii ii. var. U. S. N. M. 104S45. 



Cotype 73 



Exterior (if imperfect (earless) right valve; altitude 03 mm. Same locality as last. 



166 



