PLIOCENE PECTENS. 95 



associated, accordini;- to Doctor Merriani (see Merriani, 1900, p. 223), with Oiiicclltiria 

 2 n. sp., C'rejndvla sp. indet., Drill i(( sp., Ilimiites neai" gigantem, Natlca (Never ita 

 {aff.) reeliizlana, Prienc {aif.) orer/one/ix/x, HaiieUa californiea^ and Trocliita'A\). indet. 

 At Olinda, Puente Hills, Orange Count}', Mr. Eldridge found P. auhuryi with 

 the following- lower Pliocene fauna: Pecten. ashleyi, P. vxittsi, P. oweni. var., Priene 

 (aff.) oregonenuH^ Cardiiun (rf.) quadrigenarii(m, JVeverita recliiZMna, Pluimldex 

 callfornicm, Fusus {cf.) harharensis, Area multicostata (?), JVassa perjiuiyuis (?), 

 Ckio?ies])., Li'da ta/>/ir/'a, Fimuridea murina, Nassa fossata, Phacoide.'< riehthqfeni, 

 Phavoides nuttaUi, PJiacoides {cf.) acatilineatiis., Cardiuin {rf.) corhh^ Chione sp., 

 Dentalwm. neoJwxagonum., Solen {(f.) ^icarm.\', Tiirritclla cooperi., Cri-jiidida nujom, 

 Asiijrii^ sp., Cancellaria n. sp., CaVioxtoma costatuin, 2f'idioliis {cf.) rectiix. Bulla 

 punctulata^ and Dentcdin.m n. sp. (like Miocene form). 



The type specimen is from the first-mentioned locality, and is now in tiie State 

 Mining Bureau. Named in honor of Mr. Lewis E. Anbury, State Mineralogist of 

 California, through whom the writer was enabled to procure the valuable Pecten 

 material in the State museum. 



Pliocene. Locality SS, 1 mile east of the Chandler wells. Puente Hills, Los Angeles 

 County (Watts): Several localities in the vicinity of Olinda and Brea Canyon, 

 Puente Hills, Orange County (Eldridge). 



Pecten (Pecten) bellus Conrad. 

 PI. XXXI, figs. 1 iind 1(1. 



1857. Janira hella Conrad, Proc. Acad. Nat. Sci. Phila. , for ISoii, p. 'AVI. 



1857. Janira hella Coiirad, Pac. R. E. Kept., vol. 6, 1S57, }i. 71, pi. 3, fijr. ItJ. 



1869. Janira hella Conrad, Gabb, Pal. Cab, vol. 2, 1869, p. 105, pi. IB, fig. 20. 



1888. Janira hella Conrad, Cooper, Seventh Ann. Rept. Cal. St. Min., 1888, p. 244. 



1898. Peclen (I'ccten) hellns Conrad, Dall, Trans. Wagner Free Inst. Soi., vol. .3, pt. 4, 1898, p. 704; not 



P. belliK McCoy ((e.s-(e Dall, 1898). 

 1900. Vola sp. indet., Merriani, Bull. Cal. St. Min. Bureau, No. 10, 1900, p. 222, table III. ' 

 1903. Pecten (Pecten) hellus Conrad, Arnold, Mem. Cal. Acad. Sci., vol. 3, 1903, p. 103, pi. 21, figs. 1, 2. 



Description. — Shell large, thin, inequivah-e, elegantlj-, radiate!}' ribbed. Left 

 (upper) valve slightly convex, the point of greatest convexity being generally about 

 one-fourth the distance from the apex toward the ventral margin; between this point 

 of greatest convexity and the apex there is a deeply depressed area, the depression 

 generally not affecting the two outer ribs on each side, which inclose the depression 

 on the sides; surface of left valve ornamented by 13 or 1-1 prominent, flat-topped, 

 sometimes faintlj' bicarinated, radiating ribs, which have flat, sloping sides; these 

 ribs become broader, less elevated, and le.ss sharph' angulated near the periphery in 

 the adult; interspaces slightly wider than the tops of the ribs, with slightly rounded 

 bottoms; whole surface of left disk covered with tine, sharp, concentric, regular 

 lamella^; ears rather small, subequal. slightly concave, finely concentrically lamel- 

 lated, separated from the disk by an impressed line. Right (lower) valve promi- 

 nently convex, the point of greatest convexit}' being about one-third the distance 

 from the apex to the ventral margin of the disk; the umbo in this valve curves 

 sharply and meets the plane of the ears at an angle of about 90 degrees; surface 



