PLATE XXXII. 
Miocene Pelecypoda, Gasteropoda, and Crustacea. 
(All figures natural size.) 
Fig. 1 . Pecten ( Hinnites) giganteus Gray. U.S.N.M. 164965. Exterior of right 
valve; altitude 90 mm. Lower Miocene, supposed equivalent of Vaque- 
ros formation, gulch east of Wiley Canyon, southwest of Pirn, Ventura 
County. A very variable species ranging from the lower Miocene to the 
Recent fauna. 
Fig. 2. Ostrea titan Conrad. U.S.N.M. 164987. View of exterior of larger valve; 
altitude 131 mm. Lower Miocene, 3 miles south of Calabasas, Los Ange¬ 
les County. A common form in the upper and lower Miocene; often 
grows to a length of 20 inches (500 mm.) or more. (See PI. XXVII, fig. 2.) 
Fig. 3. Trochita costellata Conrad. U.S.N.M. 164994. View from above; maximum 
diameter 38 mm. Same locality as fig. 2. Common in the Miocene. 
Fig. 4. Phacoides richthofeni Gabb. U.S.N.M. 164978. Right valve; altitude 17.5 
mm. Same locality as fig. 2. 
Fig. 5. Balanns concavus Broun. U.S.N.M. 164971. Type. Lateral view; maxi¬ 
mum latitude 26 mm. Lower Miocene or upper Oligocene, Little Sespe 
Creek, Ventura County. A very common species in this horizon. 
Fig. 5 a. Same species as fig. 5. Top view. 
