64 TERTIARY AND QUATERNARY PECTENS OF CALIFORNIA. 



P. (iwiiii \n associated with the following possibly upper San Pablo (upper 

 Miocene) fauna at the Double Eagle wells, in the Coalinga district, Fresno County: 

 TiuiihiKoiiKi (jr<'<jaria, Pisania {aff.)fo7'tis, Tresm (?) sp., Olycyiin'rls patuhm (?), and 

 Sa.riddinus (/IhhoHKx. This fauna, although containing Tamiosimia gregaria, lacks the 

 two most characteristic species of the San Pablo formation of this locality, viz, 

 Pi'cten estrellmiHS and Ostrea titan. The beds at the Double Eagle wells represent 

 the up])ei- part of the San Pablo as developed in the Coalinga district, so that P. oireni 

 may. tiicrefore, be considered as only occurring in the upper part of the San Pablo, 

 or. in other words, in beds transitional from the San Pablo (upper Miocene) to the 

 Purisima (lower Pliocene). Just above the first railroad bridge across Wartham 

 Creek, Fi'esno County, I', mve/ii is associated with the following fauna in beds 

 probably representing about the same horizon as those exposed at the double Eagle 

 wells above referred to: Saxidoinus giihosuSy Chione n. sp. (large, coarse sculpture), 

 and TainldHOina gregaria. 



A l7-ribbed right valve of P. oweni was found 2 miles south of San Lucas, 

 Monterey County, associated with Pecten estrellaniis and varieties, Astrodopsia 

 tiiiiiidiis^ Bahdiufi estri4lanu)<, etc. 



Named at the request of Mr. F. M. Anderson after Josiah Owen, of Los Gatos, 

 Cal. 



RANGE. 



Pliocene (lower). North of Purisima, San Mateo County (F. L. Hess); Olinda, 

 Puente Hills, Orange Count}' (Eldridge); Lonoak, Salinas Vallej% Monterey 

 County (U. S. Nat. Mus. locality 3830). (Hamlin); Lewis Creek, 9 miles 

 below Priest Valley, Monterey County (locality 3833), (Hamlin). Temescal 

 Canyon, Santa Monica Mountains, Los Angeles County (Rivers). 



Miocene (upper?) Foxins, Santa Barbara County (University of California collec- 

 tion); Double Eagle wells, Coalinga district, Fresno County (Eldridge); railroad 

 bridge across Wartham Creek, Fresno County (Eldridge); San Lucas, Monterey 

 County (Hamlin; Arnold). 



Pecten (Patinopecten) propatulus Conrad. 



PI. VII, fig. 1; Pl. IX, figs. 1, l.(, 2, and 2(i. 



1849. Pfcten propatidm Conrs^A, Geol. Wilkes Expl. Exped., app. 1, 1849, p. 72H, jil. 18, figs. 1.3, 13a. 

 1S64. Pedi'ii propalulus Conrad, Meeli, Miocene Checklist, S. I. Misc. Coll., 1S64, ji. 26 ( /iV/f Dall). 

 1869. Pecten propatulus CojiT&A, Gabb, Pal. Cal., vol. 2, 1869, p. 103. (California localities excepted. ) 

 18S8. Pecten propatulus Conrad, Cooper, Seventh Ann. Kept. Cal. St. Min., 1888, p. 258 (in part). 

 1898. Pecten (Patinopecten) propatulus Conrad, Dall, Trans. Wagner Free Inst. Sci., vol. 3, pt. 4, 1898, 

 p. 699. 



Di><(j>'iptioi\. — Shell averaging about 95 millimeters in altitude, as high as long, 

 equivalve, equilateral, rather thin, somewhat ventricose and with smooth margins; 

 base regularly rounded; sides straight and sloping at a rather low angle. Right 

 valve with 1.5 or Iti subequal. squarish ribs, some of which are generally obsoletely 

 medialh' sulcated; interspaces subequal. Hat-bottomed, about as wide as ribs and 

 sometimes containing faint intercalaries; whole surface ornamented with fine, shai'p, 



