PLATE XVII. 
Yaqueros (Lower Miocene) Peleoypoda and Brachiopoda. 
(Unless otherwise indicated all figures are natural size.) 
Fig. 1 . Pecten ( Pecten ) vanvlech Arnold. U.S.N.M. 165305. Type. Right valve; 
altitude 64 mm. View of exterior. Mouth of Ballard Canyon, 2 miles 
south of Santa Ynez (4478). Characteristic of this horizon. 
Fig. 2. Pecten ( Pecten) vanvlecki Arnold. U.S.N.M. 165306. Paratype. Left valve; 
altitude 72 mm. View of exterior. Mouth of Ballard Canyon, 2 miles 
south of Santa Ynez (4478). Characteristic of this horizon. 
Fig. 3. Pecten ( Chlamys ) sespeensis var. hydei Arnold. U.S.N.M. 165308. Left valve; 
altitude 60 mm. View of exterior. Mouth of Ballard Canyon, 2 miles 
south of Santa Ynez (4478). Characteristic of this horizon. 
Fig. 4a. Terebratalla kennedyi Ball. U.S.N.M. 165325. Type. Ventral valve; alti¬ 
tude 26 mm. View of exterior. Lime quarry 5 miles southwest of 
Lompoc (4521). Characteristic of this horizon. 
Fig. 4b. Dorsal valve of same species; altitude of fragment 18 mm. View of exte¬ 
rior. 
Fig. 4c. Dorsal valve of same species; altitude 19 mm. View of exterior. 
Fig. 4 d. Ventral valve of same species; altitude 28 mm. View of exterior. 
