PLAICE XXXTX. 



PLI0CP:NK and (^UATKKXARY PI'X'TENS. 



[Unless nthcTwisi- stiilrd all lisurus nrc appr«ixiuialcl_\' naniral size.] 



Page. 



Fk;. 1. Pecten (PatinopecU'ii ) eaurimin Gould. TI. 8. X. M. lo33;! 101 



Exterior of imperlVi-t right valve of type uf CIcmrad's Pi'tien mrekii; altitude ir)4 niui. 

 I'liooene, San Raphael Hills; Santa Barbara County, f'al. (M. P.) 



Fi(i. 2. I'tcien (r<il!)iopeclni) (•a'(f///».v (iould. A. N. S,, Pliila 101 



Exterior of right valve of typi- of Conrad's I'rrlni lurriiiaiini: aUitude (11" niuL.Xl. 

 Pliocene, Santa Barbara, Cul. Photograph liy Ralph Arnolil. (M. IS. I 



Fiii. ;!. I'irlen {Plugioi'lniinin) jiaiiricDxIittiix Carpenter, U. S, N. M. 1.56346. Type 137 



Exterior of riglit valve, anterinr ear lirokeii 'iff; altitude 32 nun. Kereut, (ndf of 

 California. i.M. I'.. 1 



Fiii. 3((. Same speeinien as lit:. 3 137 



Profile of right valve as viewi'd from the rear. (M. P.) 



Fig. 4. Pectin ( Pliii/luiirtiiiini.) pii ucicDislitl ux C-drpenh'.r. U. S. N. M. 15t).346. Cotype 137 



Exterior of left valve; altitude 35 mm. Same loeality as tig, 3. (M. P.) 



222 



