LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

description of species 135
Stewart notes that "on the body whorl the anterior angle, at least, is orenulated".
He gives the following measurements for the holotype: height (incomplete), 20 mm.;
smallest diameter of body whorl (crushed), 12 mm.
According to Stewart (1928, p. 365), "A specimen in the U. S. National Museum
collected by Dr. Stanton (Locality 1092), one-half to three-fourths of a mile east
of Wilcox's ranch, on the road from LowTey's to Paskenta, ... is probably this
species."
This locality east of Wilcox's ranch is in the lower beds of tho Horsetown group,
and the record of this species here accords with the writer's findings.
This species has been obtained at Locality 1353 (Calif. Acad. Sci.), near the
bridge on the Cottonwood Creek at Ono, Shasta County; although the example ia
too much crushed for illustration, it is easily recognized. It affords the following
measurements: height of spire (incomplete), 20 mm.; width of whorl, 20 mm.
Its horizon is that of the Ono zone, near the base of the Horsetown group of the
Shasta series,
VOLTJTIDAB Gray
Volutoderma Gabb
Volulodtrma milraeformit (Gabb)
Cordicra milraeformis GABB, Paleont. Calif., vol, 2, I860, p. 153, pi. 26, fig. 32;
"Shasta Group," Colusa County, near the Hot Sulphur SpringB"—STANTON,
U. S. Geol. Surv,, Bull. 133, 1895, p. 19; listed with others from the above
locality.
Votutoderma mitraeformia (Gabb), STEWABT, Phila. Acad. Nat. Sci., Pr., vol. 73,
1926, p. 410; quotes Gabb aa to locality and horizon.
The locality and horizon of this apeciee have apparently been misunderstood.
Although the species is mentioned by Stanton, together with three others aa "possibly
belonging in the Knoxville fauna/' he omitted them until something more is
learned of their stratigraphic position.
This list includes Paleotraelus crassue, RingineUa polita, and Liocium punciatum
Gabb. From Gabb's statements it appears that all of them came from the same
locality, which he has described variously, but which can only be correctly understood
as near the outer border of the foothills, east of Wilbur Springs; therefore, the
horizon of all of them should be the middlo port of the Chico series. Tbe presence
of A treeiua liraiua Gabb, a well-known Shasta speeiee, in Gabb's list may be regarded
as accidental, since it is not an associate of the other species in other placea, or probably
in any place.
Although species of Volutoderma are common in the Upper Cretaceous of California
and Oregon, none have yet been authentically recorded from the Shasta series,
and its alleged presence there should be accepted with reserve.
ACTEONIDAE d'Orbigny
Tornaiellaea Conrad, 1SG0
TornaUUaca imprMia (Gabb)
Aclaeon (Tornaltlla) imprestui GABB, Paleont. Calif., vol. 1, 1B64, p. 142, pi. 21,
fig. 106; vol. 2,1866, p. 232; "Shasta Group," North fork of Cottonwood Creek,
Shasta County—STASTOW, U. S. Geol. Surv., Bull. 133, 2895, p. 13; included
in a list of Horsetown species from near Wilcox's ranch.
Tomatcllaea impreasa (Gabb), STEWART, Phila. Acad, Nat. Sci,, Pr,, vol. 73, 1926,
p. 434, pi, 24, figs. 7, leetotype figured.