PLATE XXVI. 
Eocene Pelecypoda and Gasteropoda. 
(All figures natural size unless otherwise noted.) 
Fig. 1. Pecten (Chlamys) calhinsi Arnold. Univ. California. An imperfect left valve; 
altitude 45 mm. Eocene, Sisar Creek, Ventura County. 
Fig. 2. Same species as fig. 1. Univ. California. Imperfect right valve; altitude 
29 mm. Same locality as fig. 1. 
Fig. 3. Pecten ( Propeamusium) interradiatus Gabb. Left valve; altitude 25 mm. 
Pal. Cal., vol. 2, pi. 33, fig. 98. Eocene shales at New Idria, San Benito 
County, and in Silver Thread district, Ventura County. 
Fig. 3a. Same specimen as fig. 3. Interior of left valve. Pal. Cab, vol. 2, pi. 33, 
fig. 98. 
Fig. 36. Same species as fig. 3. Outline of ears of right valve. Pal. Cab, vol. 2, 
pi. 33, fig. 98a. 
Fig. 4. Glycymeris veatchii Gabb var. major Stanton. U.S.N.M. 165003. Imperfect 
left valve; longitude 30 mm. Eocene, Rock Creek, Los Angeles County. 
Found in the lower Eocene (Martinez formation) in California. 
Fig. 5. Cardium breiverii Gabb. Right valve; longitude 51 mm. Pal. Cab, vol. 2, 
pb 24, fig. 155. Common in the Eocene (Tejon formation and equivalents). 
Fig. 6. Teredo sp. U.S.N.M. 164972. Type. Imperfect section of tube, lateral 
view; diameter 11 mm. Eocene, Sisar Creek, Ventura County. 
Fig. 6 a. Same species as fig. 6. U.S.N.M. 164972. Cotype. Cross section of a 
crushed specimen; maximum diameter 15 mm. Same locality as fig. 6. 
Fig. 7. Fusus remondii Gabb. Front view; altitude 41 mm. Pal. Cab, vol. 1, pb 18, 
fig. 36. Common in Eocene (Tejon formation and equivalents) on west 
coast. 
Fig. 7a. Same specimen as fig. 7. Magnified view of surface. 
Fig. 8 . Amauropsis alveatus Conrad. U.S.N.M. 165000. Front view of partially 
decorticated specimen; altitude 32 mm. Eocene, Rose Canyon, San 
Diego County. A characteristic Eocene gasteropod. 
Fig. 9. Morio ( Sconsia ) tubercutatns Gabb. U.S.N.M. 164999. Front view of an 
imperfect and decorticated specimen; altitude 27 mm. Eocene, Rose 
Canyon, San Diego County. Perfect specimens have an anteriorly plicate 
plate over the inner lip; outer lip crenulate; revolving lines on surface. 
Fig. 10 . Cylichna costatci Gabb. U.S.N.M. 165001. Front view of slightly imperfect 
specimen; altitude 18 mm., twice natural size. Eocene, Rose Canyon, 
San Diego County. Common in the Eocene (Martinez and Tejon forma¬ 
tions and equivalents). 
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