LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

description of species 227
relatively narrower. The holotype was found with bytveetaa ealumale, Acroteuthis
akaatenaia, Aucella solida Lahusen, and A. inflaia Toula. According to information
given by the collectors, all theeo apecies came from the lowest sedimentary beds
exposed in this district, with the exception of some thought to belong to the Franciacan
series. A specimen of A. farnensts has been found in the upper part of the
Paskenta group in tbe Hnmlm-Broad zone in the Cottonwood district, and apparently
also in the Ono zone near Ono, Shasta County.
AcrolctUhia kewana Anderson, n. sp.
tPlate 24, Bgurw 1,
Guard moderately stout, short, somewhat fusiform in outline, the sides converging
slightly upward os well as toward the apex; ventral groove pronounced, deep, extending
nearly to the apex; phraginaeone short, angle of its sides about 30 degrees;
axis excentric, nearer the ventral groove; apex acuminate. The holotype (Calif.
Acad, Sci. type Coll.) has a total length of 93 mm.; greatest diameter, 21 mm.;
depth of alveolus, 22 mm.; width of alveolus at top, 11 mm. The species lias some
resemblance to A. enoenaii nov., especially in size and excentricity of axis, but it is
more robust and differs notably in outline of guard, The holotype and large fragments
of other examples of the species were obtained by W. S. W. Kaw and Carl
Bremner on Honda Creek, 3,-3 miles southwest of Lcmpoe, Santa Barbara County,
at tbe west end of the Santa Ynca range; they were associated with species of Avcclla
resembling A, iabtttem Pavlow. As other species of Lower Cretaceous Aucella
have been found a few miles farther east in the same range, it is probable that A.
kewana also represents a Lower Cretaceous horizon, not higher than the top of the
Paakenta group of the Shasta series.
Acroteuthis onmrit Anderson, n. sp.
(PIMeSl. fiiura 3. 3»)
In outward appearance the guard of this specics haa some resemblance to that of
AeroleuiiWj imprwaa (Gabb), although it is relatively a little more slender and
possesses &. more acuminate point. In section it ia Bubcircular, the dorso-ventral
diameter being a little greater than that at right angles, and the ventral surface
is a little Battened. The ventral groove is moderately developed and terminates
much above the apex. The axis of the guard and of the phragmacone is excentric,
being a little nearer the ventral side of the guard, as shown in the figured section,
No complete example of thia species has yet been found, although the form iB well
known in the lower part of tbe Horsetown group in the Cottonwood and McCarthy
Creek districts, and has been found farther south. The holotype (Calif. Acad. Sci.
type Coll.), representing ths upper four-fifths of the guard, includes most of the
phragmacone. It has ths following dimensions: length (incomplete), 125 mm.; width
of the guard, 20.2 mm.*, dorso-ventral diameter. 20 mm. or less. Thia example was
found a little above the Mitchell zone in the lower part of the Horsetown group, at
Locality 1657 (Calif. Acad. Sci.), on Mitchell Creek, half a mile north of Hearing
River. Fragments of the same species have been found in the lower part of the
group and at the top of the Paakenta group on the Cottonwood Creek, near Ono.
Aeroteulhis mlcoxi Anderson, n. sp.
(Flute 31, flgufei 1. Is. 2)
Belemniteasp. {?), STANTON, U. S.Geol. Surv,, Bull. 133.1855, p. 8fi; Shelton's ranch, 5
miles north of Paskenta, Tehama County.