LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

Turbo vrilburerutii STANTOK, U. 8. Geol. Surv.T Bull. 133, 1895, p. 65, pi. 12, fig. 15;
in tho white limestone near Wilbur Springs, Colusa County.
The concise description of Stanton ia:
"Shell of medium size, elongate ovate, consisting of five or six rounded whorla;
suture linear, impressed; surface ornamented with small, elevated, slightly nodose
revolving lines, of which there are about twenty on the body whorl, and about nine
axe visible on the spire."
Height of largest specimen, which is incomplete at the apex, 34 mm.; greatest
breadth, 26 mm
At the type locality near Wilbur Springs, this specics is associated with Rhynchondla
whilneyi, Modiolus major Gabb, Pecten complericosta, Lucina colusaetuit,
and other species of Turbo. Most of the species are also found at other localities
near the base of the Paskenta group.
"TWfce" humeronis Stanton
Turbo ? humerotua STANTON, U. 8. Geol. Surv., Bull. 133, 189$, p. 67, pi. 12, figs. 10,
11; 3 miles south of Lowry's, Tehama County.
This shell is distinguished from preceding species referred to the genus Turbo
by angulated ridge on the upper part of tho hody whorl, and broad ovata, rather than
circular, aperture. It appears to be only doubtfully included in Turbinidae, but to
be more correctly Inoluded in the family to which Ambtrtlya belongB,
Although its locality ia given as 3 miles north of Lowry's, the species is included
in a list (Stanton, 1895, p. 17) from a locality 3 miles south of this place, which seems
to be the mora probable position. It is said to occur also in the white limestone near
Wilbur Springs, Colusa County. Both localities are in the Paskenta group of tho
Shasta series.
Atrcsius Gabb
Alretiut liratvs Gabb
Atresia Kratui GABB, Paleont. Calif., vol. 2,186®, p. 169,227, pi. 28, fig,50; "Shasta
Group," Sulphur Springs, Colusa County—STANTON, U. S. Geol. Surv., Bull.
133, 1896, p. 68, 69; locality as above, and one mile northeast of the Palmer
ranch, Morgan Valley, Lake County, "upper part of the Knoxville"—STEW-
ART, Phila. Acad. Nat, Sci., Pr., vol. 78, 1926, p. 426, pi. 23, fig. 3; holotype in
tbe Museum of Comparative Zoology, Harvard University, figured.
This species is common in the white limestones of the Paskenta group in tbe
Coast Ranges south of Shasta County. It is recorded from various places, aa near
Wilbur Springs, Colusa County; Morgan Valley, Lake County; west border of
Berryesaa Valley, Napa County; and in the Berkeley Hills, north border of Berkeley.
In nearly all cases it haB been found associated with Aucella of the types found in the
Paskenta group. It may accordingly be regarded as an index fossil of this group.