. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. 1. Fig. 6. Chlorostoma (Omphalius) dalli var. subnodosus Arnold. 1649851Type. Topview; latitude 13 mm.; 1£ times natural size. Same locality!as Fig. 4. Fig. 6a. Base view of same specimen as fig. <i. Fig. 7. Cerithium topangensis Arnold. L64976. Type. Aperture viewoimperfect specimen; longitude 23 mm.; 1. times natural size. LowenMiocene, 3 miles south of Calabasas, at head of Topanga Canyon, LotAngeles County. A common species a1 the type locality. Fie. 8
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. 1. Fig. 6. Chlorostoma (Omphalius) dalli var. subnodosus Arnold. 1649851Type. Topview; latitude 13 mm.; 1£ times natural size. Same locality!as Fig. 4. Fig. 6a. Base view of same specimen as fig. <i. Fig. 7. Cerithium topangensis Arnold. L64976. Type. Aperture viewoimperfect specimen; longitude 23 mm.; 1. times natural size. LowenMiocene, 3 miles south of Calabasas, at head of Topanga Canyon, LotAngeles County. A common species a1 the type locality. Fie. 8. Cerithium topangensis Arnold. Cotype. Aperture viewof imperfecl specimen; longitude L3 mm.; I \ times natural size. Samtlocality as fig. 7. Fig. 9. Cancellaria cf. condoni Anderson. L64981. Back view of imperfecUspecimen; altitude 21 mm.; 1 \ times natural size. Lower Miocene, 2miles south of Calabasas, bos Angeles County. This species appears t BULLETIN NO. 309 PL. XXVII. MIOCENE PELECYPODA AND GASTEROPODA. PLATE XXVIII. Miocene Pelecypoda and Gasteropoda. Fig. 1. Pecten (Lyropecten) magnolia Conrad. Univ. California. Imperfect righlvalve; altitude mm.; aboul two-thirds natural size. Lower Miocene,Vaqueros formation, Ojai Valley. Ventura County. Characteristic of thelower Miocene throughout central and son! hern California. The left valvehas narrow, more rounded ribs. Ftg. 2. Pecten (Lyropecten) estrellanus Conrad. 164851. Left valve; alti-tude 97 nun.; aboul two-thirds natural size. Upper Miocene, Wildhors!Canyon. Monterey County. This species is usually abundant in both llulower and upper Miocene faunas of central and portions of southern Cali-fornia. Ribs of righl valve broader and anterior ear notched; otherwisesimilar to lefl. Fig. 3. Drilliasp. 164977. Type. Backview; longitude ;abou]I, times natural size Lower Miocene, head of Topanga Canyon, 3 milejsouth of Calabasas, Los Angeles County. Fig. 1. Macron merriam
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