38G CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE XIL 



Fig. I. PecUn (Pecfen)i/fn/a/t/s SowERnw Living shell from Gulf of California. Exterior 



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



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



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



Exterior of left valve. Altitude 23 mm.; x i 3. Ill 



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



Fig. 3. Pecten ( Pcdeit) sUartisii Dai.i.. Pliocene, San Diego. Exterior of left or flat 



valve. Altitude 65.5 mm.; natural size. 106 



Fig. 4. PecteJi (Chlatnys) laliauritus var. mo7!otitiieris Conrad. 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 (Pecteii) diegc7isis Dall. Living shell, Monterey. Outline, showing con- 

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

 P. stramsii). 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. ; xo.g. ill 



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



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



Pedro. Type specimen, exterior of right valve. Altitude 25 mm. ; xi.3. 112 



