PLATE XXIX. 
Miocene Echinoidea and Pelecypoda. 
Fig. 1. Pecten (Amusium ) lompocensis Arnold. U.S.N.M. 1G4852. Cotype. Inte¬ 
rior view, showing internal lirse; altitude 90 mm.; about two-thirds natu¬ 
ral size. Lower Miocene, Ojai Valley, Ventura County. This form, so 
far as known, is confined to the lower Miocene of Santa Barbara and Ven¬ 
tura counties. 
Fig. 2. Ostrea eldridgei Arnold. U.S.N.M. 164986. Type. View of exterior of larger 
valve; altitude 14.7 mm.; two-thirds natural size. Lower Miocene, sup¬ 
posed equivalent of Vaqueros formation, Elkins ranch, east of Grimes 
Canyon, south of Fillmore, Ventura County. 
Fig. 2a. Lateral view of same specimen as fig. 2. 
Fig. 3. Scutellafairbanksi Merriam. U.S.N.M. 164963. View of top, showing details; 
maximum diameter 36 mm.; 1J times natural size. Lower Miocene, sup¬ 
posed equivalent of Vaqueros formation, near Torrey Canyon wells, south¬ 
west of Piru, Ventura County; abundant. This species is also found near 
the base of the Vaqueros formation in the Sespe district. Supposed to 
be characteristic of the lower Miocene. 
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