PLATE XXXITI. 



PLIUCEXE AXI) PLEISTOCENE PECTENS. 



[T'nle^s nttnTwisL' stated all tiffiirt's are approximately natural size.] 



Page. 



Fig. 1. IWIen ( l'i'r(ni) r,y,l,sl n. sp. D. A. Type 100 



Exterior of iiii|)erfert riglit valve; altitude 6S iiim. S.m Pi-ilni fdnnat'citi (Pleistueciie ), 

 Sail Peilro, Los Angeles County, Cal. (M. P.) 



Fig. 1((. Same specimen as fig. 1 100 



Profile of right valve as viewed from tlie rear. (,M. P.) 



Fig. 2. J'n-len (IVrlni) iviUuriii w. sp. C. S. M. 11. Tyjie V(4 



Exterior of imperfeet right valve; altitude 4G mm. Plioi-eue, Pueiite Hills, Los Angeles 

 County, Cal. (S. ) 



Fig. 2a. Same specimen as fig. 2 94 



Profile of right valve as viewed fmm the rear. (M. P.) 



¥\v,. -A. I'i'Heii (Pcctert) hemi>hiUi DaW. U. S. N. M. 794y. Tyjie 97 



Exterior of right valve; altitude 57 mm. San Diegn formation (Plioeene), Pacific Peach, 

 San Diego County, Cal. ( M. P.) 



Fig. Hn. Same specimen as fig. 'A 97 



Exterior of left valve. (M. P.) 



Fig. Ah. Same specimen as fig. 'A ....._ 97 



Profile of both valves as viewed rnnii the rear. ( M. P.) 



Fui. 4. Prcten ( Pcclni) Irmntei n. sp. 1 ). .\ . Type 98 



Exterior of right valve; altitude .Ml iiim. Plii)cene, Cerros Lslaiid, off l^cjwer California. 

 (M. B.) 



Fig. 4a. Same specimen as fig. 4 98 



Exterior of left valve. (M. B. ) 



Fig. 46. Same specimen as fig. 4 98 



Profile of both valves as viewed from the rear, i, M. P.) 



210 



