PLATE XV. 
Vaqueros (Lower Miocene) Fossils. 
(Unless otherwise indicated all figures are natural size.) 
Fig. la. Purpura vaquerosensis Arnold. Collection of Delos Arnold. Type. Alti¬ 
tude 100 nun Aperture view. Lynchs Mountain, Monterey County, Cal. 
Fig. 16. Back view of same specimen. 
Fig. 2. Modiolus yneziana Arnold. U.S.N.M. 165324. Type. Right valve; altitude 
31mm. View of exterior, X 2. San Julian ranch (4504 ). Characteristic 
of this horizon. 
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