LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

EXPLANATION OF PLATES 273
PLATE 28.—CRETACEOUS FOSSILS FHOH CALIFORNIA
(1, 1ft) £tfnbtrjA-t{es broadi nov. Paratype. Greatest diameter, 45 mm.; thickness
of whorl, 2QJ mm. Hamlin—Broad zone, upper part of Faakenta Group;
Loc. 113 (C. A. S.), 4 miles southwest of Ono, Sbnata County, (la) Plaster oast
from rock mold, showing ventral zone and ribbing on the periphery of the shell,
p. 155.
(2) Dichotomy ta lehamacntit nov, Holotype. Greatest diameter, TO mm,;
thickness of whorl, 27 mm. "Zone W, Paskenta Group; Loc. 1343 (C. A. S.),
Wilcox ranch, 5 miles north of Paskenta, Tehama County, p. 15S.
(3, 4) Dichoiomiteis gregcTWTii nov. (3) Holotype, aomewliat enlarged. Greatest
diameter, SI mm.; thickness of whorl, mm. "Zone Mi", Paakenta Group;
Loc. 1343 (C. A. S_), Wilcox ranch, Tehama County, (4) Paratype, reduced.
Greatest diameter, 45 mm. Same locality and horizon as the holotype. p. 1,58.
(5) Dichotcmitca burgcri nov. Holotype. Greatest diameter, 60 mm.; thickness
•f whorl, IB mm. "Zone M,'\ Paskenta Group; Loo, IMS