386 CALIFOENIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE XIL 



Fig. I. Pecle7i ( Pecfc7i) denfahis SowEV.Ti\. Living shell from Gulf of California. Exterior 



of left or flat valve. Altitude 58 mm.; natural size. 104 



Fig. la. Same specimen. Outline, showing convexity of right valve; natural size. 104 



Fig. 2. Pecten (Chlamys) laliauritus Conrad. Upper San Pedro series, San Pedro. 



E.xterior of left valve. Altitude 23 mm.; xi 3. m 



Fig. 2a. Same specimen. Outline, showing convexity of same valve; XI.3. m 



Fig. 3. Pecten (Pecten) stcarnsii Dall. Pliocene, San Diego. Exterior of left or flat 



valve. Altitude 65.5 mm.; natural .'^ize. 106 



Fig. 4. Pecten (Chlamys) taliauriliis vs.r. nio>iot!wen's 'Coi^RAV. Upper San Pedro series, 



San Pedro. Exterior of left valve. Altitude 20.5 mm. ; xi-3- 112 



Fig. 4a. Same specimen. Outline, showing convexity of same valve; XI.3. 112 



Fig. 5. Pecten (Pecten) diegcnsis Dall. Living shell, Monterey. Outline, showing con- 

 vexity of right valve (which is the same as the convexity of the right valve of 

 P. stearnsii'). Altitude 72 mm.; natural size. 106 



Fig. 6. Pecten ( Chlamys) jordani, sp. nov. Pliocene, Deadman Island. Type specimen, 



exterior of right valve. Altitude 51 mm. ; X0.9. iii 



Fig. 7. Same specimen, exterior of left valve; xo.g. 11 1 



Fig. 8. Pecten (Chlamys) taliauritus var. fragilis, var. nov. Upper San Pedro series, San 



Pedro. Type specimen, exterior of right valve. Altitude 25 mm. ; Xi-3. H2 



