. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. cardia planicosta Lamarck. L64973. Left valve; longitudesi linn. Eocene, Little Falls, Wash. This is the most widespread andcharacteristic Eocene species in the world. Found in the Sespe andSilver Thread districts, Ventura specimen as fig. I. View of anterior end of both specimen as fig. 1. View of both valves from above.(milium cooperii Gabb. L64998. A decorticated right valve; longi-tude 35 mm. Eocene, Rose Canyon. San Diego County.

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. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. cardia planicosta Lamarck. L64973. Left valve; longitudesi linn. Eocene, Little Falls, Wash. This is the most widespread andcharacteristic Eocene species in the world. Found in the Sespe andSilver Thread districts, Ventura specimen as fig. I. View of anterior end of both specimen as fig. 1. View of both valves from above.(milium cooperii Gabb. L64998. A decorticated right valve; longi-tude 35 mm. Eocene, Rose Canyon. San Diego County. A commonspecies in the Eocene of the west specimen as fig. 2. View of both valves from hornii Gabb. Lefl valve: longitude 36 mm. Pal. Cal., vol. 2. pi. 30,fig. 7V. A common species in the Eocene of the west 4. Modiolus ornatus Gabb. Right valve; longitude 38 mm. Pal. Cal., vol. 1,pi. 24, fig. Kin. Another species found in most Eocene faunas of thewest coast. 222 Fig, La, Fig , 1/. Fig. , 2. Fig . 2a, Fig. 3. U. S. GEOLOGICAL SURVEY 3ULLETIN NO. 309 PL. XXV ?? -^^& >.

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