NEW CRETACEOUS AND TERTIARY PHOLADIDAE (MOLLUSCA, BIVALVIA) FROM CALIFORNIA

Cretaceous and early Tertiary Pholadidae (Mollusca: Bivalvia) from the Pacific Slope of North America are rare and only poorly known. Three new species, each the earliest known Pacific Slope representative of i ts respective genus, are described: Barnea (Anchomasa) saulae n. sp. ( Pholadinae) from the Upper Cretaceous (Coniacian and Santonian) Reddin g Formation near Redding, uppermost Sacramento Valley, Shasta County, northern California; Chaceiafulcherae n. sp. (Martesiinae) from three widely separated areas of outcrop represented by 1) the middle Miocene (''Temblor'') Temblor Formation near Oil City and in Jasper Canyon, w estern Fresno County, central California, 2) the middle Miocene (''Tem blor'') Topanga(?) Group in the northern Santa Ana Mountains, Orange C ounty, southern California, and 3) the upper Miocene (Wishkahan) Monte sano Formation on the Middle Fork of the Satsop River, Mason County, w estern Washington: and Netastoma squiresi n. sp. (Jouannetiinae) from the lowest Eocene (uppermost ''Meganos'') part of the Santa Susana For mation north of Simi Valley in the Santa Susana Mountains, Ventura Cou nty, southern California.