A NEW GENUS OF CASSIDULOID ECHINOID FROM THE LOWER EOCENE OF THE PACIFIC COAST OF WESTERN NORTH-AMERICA AND A NEW REPORT OF CASSIDULUS-ELLIPTICUS KEW, 1920, FROM THE LOWER EOCENE OF BAJA-CALIFORNIA-SUR, MEXICO

The cassiduloid echinoid Calilampas californiensis n. gen. and sp. is described from middle lower Eocene (''Capay Stage'') shallow-marine sandstones in both the middle part of the Bateque Formation, Baja California Sur, Mexico, and the lower part of the Llajas Formation, southern California. The new genus is tentatively placed in family Pliolampadidae. The cassiduloid Cassidulus ellipticus Kew, 1920, previously known only from the ''Capay Stage'' in California, is also present in ''Capay Stage'' shallow-marine sandstones of the Bateque Formation.