. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. California in the lower la. Mold of interior of left valve of same specimen as fig. 2. Pecten (Chlamys) sespeensis Arnold. California State Mining Bureau. Plasto- type. Cast of exterior of slightly imperfect left valve (young); altitude. 18 mm. Same locality as lig. 3. Pecten (Lyropectcn) vaughani Arnold. Collection of Delos Arnold. Type. Right valve; altitude 37 mm. Lower Miocene, supposed equivalent of Vaqueros formation, Ojai Valley, Ventura Count
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. California in the lower la. Mold of interior of left valve of same specimen as fig. 2. Pecten (Chlamys) sespeensis Arnold. California State Mining Bureau. Plasto- type. Cast of exterior of slightly imperfect left valve (young); altitude. 18 mm. Same locality as lig. 3. Pecten (Lyropectcn) vaughani Arnold. Collection of Delos Arnold. Type. Right valve; altitude 37 mm. Lower Miocene, supposed equivalent of Vaqueros formation, Ojai Valley, Ventura 3a. Same specimen as fig. 3. heft 4. Dosiniaponderosa Gray. 1G4988. Imperfect right valve; altitude 80 mm. Lower M iocene, 3 miles south of Calabasas, Los Angeles County. A common species from the lower Miocene to the Recent southern fauna of the wesl 5. Pleurotoma (Dolichotoma) keepi Arnold. 164993. Type. Back view of imperfect specimen. Same locality as fig. 4. Found also in this horizon at several localities in southern San Joaquin BULLETIN NO. 309 MIOCENE PELECYPODA AND GASTEROPODA. PLATE Pectens. (All figures about two-thirds natural size.) Fig. 1. Pecten (Patinopecten) healeyi Arnold. 148012. Type. Exterior ofright valve: altitude L2] mm. San Diego formation (Pliocene), SanDiego County. A characteristic form in the lower Pliocene from SanMateo County to the Mexican Line. Left valve with narrow rounded ribsand intercalaries; disk also less convex. Fig. 2. Pecten (Lyropecteri) ashleyi Arnold. Univ. California. Type. Exterior ofrighl valve; altitude 155 mm. Pliocene, Cerros Island, off Lower Cali-fornia. Also characteristic of the lower Pliocene, but so far known onlyas far north as Santa Barbara County. The left valve has slightly nar-rower ribs and no byssal notch in the anterior U. S. GEOLOGICAL SURVEY ;: BULLETIN NO. 309 PL. XXXIV
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