LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

312 lower cbxtace008 deposits in california and oregon
PLATE 57.—CRETACEOUS FOSSILS FROM CALIFORNIA
(1) Ancyloeerav durreUi nov. Holotype. Total length of figured part of the
shaft, 230 mm.; greatest diameter, 63 mm. Found about 200 feet beneath the
Mitchell zone, lower part of Horsetown Croup; Loc. 1661 (C. A. 3.), south of Roaring
River, Shaata County, p. 210.
(2) Suture line of Aneyiouras durtclti, drawn from a detached fragment found at
tho same locality and horizon, p. 210.
(3) .IMcMortlw incKffwies nov. Pleaiotype. Greatest diameter, 92 mm,; thickness
of whorl, 25 mm.; apparently a little above the Argonaut zone, upper part of
the Horsetown Group; Loo. 1348 (C, A. S.), Alderson Creek, Shasta County, p. 184.
(4,5) Sfcosltcricww ptmiente nov. Small examples from the Mitchell zone, showing
the manner of eoiling and coBtation in young stages of growth, p. 204.