PLATE r T. 



EOCENE PECTENS. 



[I'nlesw otherwise stated all figures are approxiniately natural size.] 



Page. 



Fic. 1. Pecten ( CJdaiiii/t!) calkinxl n. sj). V. (.'." Cotype 51 



Exterior of imperfect right valve; altitude 29 mm. Ti-jnn fnrmatioii (Eocene), Sisar 



Valley, Ventura ('onnty, Cal. ('S. )" 



Fic ;. 2. Pecten. ( (Idattnjx) rulk'nisi n. sp. 1'. C. Tyia- 51 



Exterior of imperfect left valve; altitude 45 mm. Same Ideality as fij;. 1. (S.) 



Fk;. 3. Peel, II ( CJiliniuis) }imde:<i n. j^p. I'. S. X. M. 164itL'(;. Type 51 



Exterior nf right valve; altitiulc Ml mm. lOcicene, Little Falls, Lewis County. Wash. 



(M. 1'.) 



Fic:. 4. J'irlei, (Clilniiiiix) landenl n. sp. T'. S. X. M. 164926. Cotype 51 



Exterior of left valve; altitude 22.5 mm. Same locality as fig. 3. (M. P.) 



Fig. 5. Peeteii ( < hhinii/x) limdei^i n. sp. U. S. N. M. 164926. Cotype 51 



Exterioi- of right valve (coarse-rilibed form); altitude 34 mm. Same locality as last. 



(M. P.) 



Fk;. 6. J'eclen. ( (Jdnmi/>: ) jironvii.-i n. sp. U. S. N. M. 164930. Type 52 



Mold of interior of left valve, showing portion of external surface sculpture; altitude 



3H nun. Eocene, between headwaters of San Lorenzo River and Pescadero Creek, 



San Mateo County, Cal. (M. R.) 



Fig. 7. Same specimen as fig. 6 _ 52 



Portion of disk showing sctilpture; enlarged twice. 



Fkj. 8. Peeteii ( Chlami/s) jii-oarim n. sp. U. S. N. M. 164930. C^otype 52 



Fragment of a large specimen. Same locality as fig. 6. 



Fig. 9. Pecten ( Pnipeeimusiiiiii ) iiiterradiiitiix ( Jalib. Type 53 



Exterior of left valve; altitude 25 ujm. ('ii]iied, with slight alteration, from Pal. Cal., 



vol. 2, pi. 33, fig. 98. Tejon fnniuitinn (Fijcene), Xew Idria, San Benito C'lUinty, 



Cal. 



Fig. 10. Same specimen as fig. 9 53 



Mold of interior of left valve; altitude 25 mm. Copied, with slight alteration, from 



Pal. Cal., vol. 2, pi. 33, fig. 98. 



Fig. 1 1. Pecten {Projieaiiniitiinn) iiileiTddiatiia < lahli 53 



Outline of hinge line and ear of right valve, ('oi)ied, Mith s'ight alti-ratidii, from 



Pal. Cal., vol. 2, 1)1. 33, fig. 98-(. 



"The initials immediately following the name of the specimen are those of the instilntion or individual to 

 whieh the speeimen belongs, and to which reference is made in the introduction; the initials or letter at tlie conclu- 

 sion oi ilic explanation indicates the artist who retouclied the figure. 



148 



