P L A 1^ E X L T . 



PLIOCENE AND QUATERNARY I'ECTENS. 



[TTnless otherwise stated all figures are apprnxiinntt'Iy natural size.] 



Page. 



Fit;. 1. recteii ( ( liJaiinix) j.ariiiehvl Dall. U. S. N. :\I. ITi-HTil. Typf 119 



Copied from Doctor McConnell's drawing of left valve; altitude 45 mm., X 5/4. (Trans. 

 Wagner Free Inst. Sci., vol. 3, pt. 5, jil. ,S7, fig. 14.) San Diego formation (Pliocene), 

 Pacifie Beach, Saa Diego Connty, Cal. 



Fig. la. Same specimen as fig. 1 119 



Copied from Doctor McConnell's drawing showing detail of secondary scnlptnre highly 

 magnified. {Idem., pi. 37, fig. 14a). 



Fill. 2. Peclen { Chlamys) opuntia Dall. U. S. N. M. 107752. Type 118 



Copied from Doctor McConnell's drawing of right valve; altitnde 33 tnm. (Trans. Wag- 

 ner Free Inst. Sci., vol. 3, pt. 4, ]il. 29, fig. 6.) San Diego formation (Pliocene), 

 Pacific Beach, San Diego County, Cal. 



Fui. 3. Pectm {Chlnmyx) liarfsclii n. sp. V. S. N. 'SI. 11)4841 . Type 107 



Exterior of portion of disli; altitnde 55 mm. Pliocene, Crescent City, Del Norte Connty, 

 Cal. (M. P.) 



Fid. 4. Pecten ( Chlamiix) hastatns Sowerby. U. S. N. M. 133.50 lOS 



Exterior of left valve of Conrad's type of Pecten altlplicatiis; longitude 55 mm. Pliocene, 

 San Raphael Hills, Santa Barbara County, Cal. (M. B.) 



Fui. 5. Perteii iCh/iuitjit) jxirmeJcei Dall. U. S. N. M. 164842 119 



Exterior of slightly imperfect right valve; altitude 70 mm. Pliocene, Crescent City, Del 

 Norte County, Cal. (M. B. ) 



Fici. 5a. Same specimen aa fig. 5 119 



Profile of right valve, as viewed from the rear. (1\I. P. ) 



Fk;. 6. Pecten ( Vhlaiinja) beUllamelhit m n. sp. D. A. Type 108 



Exterior of right valve (anterior ear slightly broken); altitude 18 mm., X 3. San Diego 

 formation (Pliocene), Pacific Beach, San Diego County, Cal. (M. B. ) 



Fk!. 6a. Same specimen and valve as fig. (5, natural size. ( M. P. ) lOS 



Fh;. 7. Same specimen as fig. 6 108 



Exterior of left valve, X 3. (M. B. ) 

 Fi(i. 7a. Same specimen and valve as fig. 7, natural size. (M. P.) 108 



226 



