PLATE XXY. 
Fernando (Pliocene) Pectens. 
(Unless otherwise indicated all figures are two-thirds natural size.) 
Fig. la. Pecten ( Pecten) stearnsii Dali. U.S.N.M. 148008. Right valve; altitude 
87 mm. View of exterior. San Diego formation (Pliocene), Pacific 
Beach, San Diego County, Cal. Common in the Fernando formation 
of southern California. 
Fig. 16. Same specimen as fig. la. Exterior of left valve. 
Fig. 2 a. Pecten (Patinopecten) oweni Arnold. Collection of University of California. 
Type. Right valve, anterior ear slightly broken; altitude 85 mm. 
View of exterior. Foxen’s ranch. Characteristic of this horizon. 
Fig. 26. Same specimen as fig. 2a. Exterior of left valve. 
Fig. 3. Pecten ( Chlamys) lawsoni Arnold. Collection of California Academy of Science. 
Type. Right valve (umbo and ears missing); longitude 65 mm. View 
of exterior. One mile north of Schumann. Characteristic of this 
horizon. 
Fig. 4. Pecten ( Chlamys ) wattsi Arnold. Collection of California Academy of Science. 
Type. Slightly imperfect left valve; altitude 66 mm. View of exte¬ 
rior. Lower Pliocene, Kreyenhagen’s ranch, Fresno County. Common 
in the Fernando of southern California. 
Fig. 5. Pecten hcmphilli Dali. U.S.N.M. 165280. Left valve; altitude 22.50 mm. 
View of exterior, X !§• One mile north of Schumann (4474). C'harac- 
acteristic of this horizon. 
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