PLATE XXXIX. 
Pliocene Bkachiopoda and Pelecypoda. 
(All figures natural size.) 
Fig. 1. Ostrea veatchii Gabb. U.S.N.M. 153827. Exterior of valve; altitude 90 mm. 
Lower Pliocene, San Diego. An abundant and characteristic species in 
many of the Pliocene localities from southern California to Cerros Island, 
off lower California. 
Fig. 2. Callista ( Amiantis) callosa Conrad. U.S.N.M. 164953. Imperfect left valve; 
altitude 50 mm. Lower Pliocene (Fernando formation), Elsmere Can¬ 
yon, near Newhall, Los Angeles County. Base evenly rounded in perfect 
specimens. Common from Pliocene to Recent. 
Fig. 3. Callista subdiaphana Carpenter. U.S.N.M. 164951. Imperfect right valve; 
longitude 41 mm. Same locality as fig. 2. Abundant in the Pliocene and 
also found in the Recent. 
Fig. 4. Terebratalia smithi Arnold. U.S.N.M. 164977. Pedicle valve; longitude 42 
mm. Pliocene, Temescal Canyon, 3 miles north of Santa Monica, Los 
Angeles County. Known only from the Pliocene. A somewhat variable 
species. 
Fig. 4a. Same specimen as fig. 4. Brachial valve. 
Fig. 5. Terebratalia smithi Arnold. U.S.N.M. 164977. Pedicle valve; longitude 29 
mm. Same locality as fig. 4. More prominent ribbing than specimen 
shown in fig. 4. 
Fig. 5a. Same specimen as fig. 5. Brachial valve. 
Fig. 6. Terebratalia occidentals Dali. U.S.N.M. 164996. Brachial valve; longitude 
40 mm. Same locality as fig. 4. This species is most variable, as is 
evidenced by this and the following figures, which show a series col¬ 
lected at one locality. Found in the lower Pliocene (and possibly upper 
Miocene). 
Fig. 7. Same species and locality as fig. 6. Pedicle valve; longitude 29 mm. 
Fig. 7a. Same specimen as fig. 7. Brachial valve. 
Fig. 8. Same species and locality as fig. 6. Pedicle valve; longitude 22 mm. 
Fig. 8a. Same specimen as fig. 8. Brachial valve. 
Fig. 9. Same species and locality as fig. 6. Pedicle valve of a less rugose variety; 
longitude 21 mm. 
Fig. 9a. Same specimen as fig. 8. Brachial valve. 
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