384 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE XI. 



Fig. I. Peden ( Plagiodenmm) newsomi. sp. nov. Upper San Pedro series, Los Cerritos. 



Type specimen, left valve. Altitude 26 mm. ; xi-4- 113 



Fig. \a. Same specimen. Outline, showing convexity of valve. X1.4. 113 



Fig. 2. Pecten ( Chlamvs) hericeus Gould. Pliocene, Deadman Island. Exterior of left 



valve. Altitude 50 mm.; natural size. no 



Fig. 3. Peden ( Plagiodenium) ventricosus SowERBY. Upper San Pedro series, San Pedro. 



Exterior of left valve. Altitude 36 mm. ; x i-3. 1 14 



Fig. 3a. Same specimen. Outline, showing convexity of valve; XI.3. 114 



Fig. 4. Pecteji (Chlamys) hastatus Sovverbv. Pliocene, Deadman Island. Left valve, 



exterior view. Altitude 38 mm.; X1.3. 109 



Fig. i,a. Same specimen. Outline, showing convexity of valve; XI.3. 109 



Fig. 5. Peden (Chlamys) hericeus var. strategj/s Dall. Lower San Pedro series. Dead- 

 man Island. Exterior of right valve. Altitude 21 mm. ; Xi-3- no 



Fig. 6. Peden ( P/agiodenutniJ veji/n'cosus SowERBV. Upper San Pedro series, San Pedro. 



Exterior of left valve. Altitude 56 mm.; natural size. 114 



Fig. 6a. Same specimen. Outline, showing convexity of valve; natural size. 114 



