384 CALIFOHNIA ACAOKMY OF SCIENCES. 



EXPLANATION OF PLATE XL 



Fig. I. Pccleii ( Plagiodenium) newsomi. sp. nov. Uiiiier San Pedro series, Los Cerritos. 



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



Fig. la. Same specimen. Outline, showing cnnve.xity of valve. XI.4. 113 



Fig. 2. Pccten (Chlamys) hericeiis Gould. Pliocene, Deadnian Island. Exterior of lelt 



valve. Altitude 50 mm.; natural size. 110 



f"'g- 3- Pedeii ( P/agioclenium) vent) icosus Sowerby. Upper San Pedro series, San Pedro. 



Exterior of left valve. Altitude 36 mm. ; xi.3. 114 



Fig. 3a. Same specimen. Outline, showing conve.xily of valve; xi.3. 114 



Fig. 4. Pectni (Chlamys) hastalus Sowerby. Pliocene, Deadnian Island. Left valve, 



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



Fig. 4a. Same specimen. Outline, showing convexity of valve; XI.3. 109 



Fig. 5. Pec/en (Chlamys) hericeus var. stralcgus Dall. Lower San Pedro series, Dead- 

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



Fig. 6. Pecleti ( Plagioctenhnn) vcntricosus Sowekbv. Upper San Pedro series, San Pedro. 



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



Fig. 6a. Same specimen. Outline, showing con\exity of valve; natural size. 114 



