. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. imilar. Fig. 4. Pecten (Plagioctenium) circularis Sowerby. 61246. Right valve;longitude 26 mm.; nearly natural size. Pleistocene, Ventura also extend down into the Pliocene. Fig. 5. Pecten (Pecten) n»i<l<si Arnold. California Acad. Sci. Cotype. Exterior ofslightly imperfect left valve; altitude 74 mm. Pleistocene, VenturaCounty. Also occurs in supposed Pliocene near San Diego. Right valvevery convex, with broad rounded ribs. llo. 6. Pecten (Plagiocten
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. imilar. Fig. 4. Pecten (Plagioctenium) circularis Sowerby. 61246. Right valve;longitude 26 mm.; nearly natural size. Pleistocene, Ventura also extend down into the Pliocene. Fig. 5. Pecten (Pecten) n»i<l<si Arnold. California Acad. Sci. Cotype. Exterior ofslightly imperfect left valve; altitude 74 mm. Pleistocene, VenturaCounty. Also occurs in supposed Pliocene near San Diego. Right valvevery convex, with broad rounded ribs. llo. 6. Pecten (Plagioctenium) cerrosensis Gabb. Univ. California. Exterior of leftvalve (anterior ear slight broken); altitude 106 mm. Pliocene, CerrosIsland, off Lower California. Also found in the Pliocene near Camulos,Newhall, and San Diego. Fig. 7. Pecten (Pecten) auburyi Arnold. California State Mining Bureau. i imperfecl right valve; altitude 46 mm. Pliocene, PuenteHills, bos Angeles County. Left valve slightly concave, with ribs nar-rower i han in U. S. GEOLOGICAL SURVEY BULLETIN NO. 309 PL. XXXV I. PLIOCENE PECTENS. PLATE Pectens. (All figures about two-thirds natural size.) Fig. 1. Pe<f< a (Patinopecten) caurinus Gould. Collection of Delos Arnold. Exteriorof left valve; altitude 105 mm. Pliocene, Deadman Island, Los AngelesCounty. Specimens of this species measuring over 8 inches (200 mm.)have been found in the Pliocene of Ventura County. This form appearsto be confined to the upper Pliocene and Pleistocene in southern Cali-fornia. Right valve more convex and with broader square ribs andplain concentric sculpture. Pig. 2. Pecten (Chlamys) latiauritus Conrad. Collection of Delos Arnold. Exteriorof right valve; altitude 25 nun. San Pedro formation (Pleistocene), SanPedro, Los Augelos County. Known also from the lower Pliocene atLos Angeles. V\(,. 3. Pecten (Chlamys) latiauritus Conrad. Collection of Delos Arnold. Exteriorof left valve; altitude 27 nu
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