LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

226 lower cretaceotffi deposits in california and oregon
Horse town group, 6 miles south of Ono. Shasta County. The holotype and other
examples were found at Locality 1347 (Calif, Acad. Sci.) associated with JVoutilus
anen'iti nov., ParaJiopKloidei sp., and other ammonoids of the Barr rone. The
guard of this species is very similar in size, form, and surface appearance to that of
the European species "Belemnites" magnifies d'Orbigny, aa figured by Pavlow and
Lamplugh; according to Stolley (1930, p. 208), the latter form is included in Acroteu-
Ms. It has not yet been found in any other district or horizon in California.
Acroleuf/iij eha&tenais Anderson, n. sp.
(PliU 81. fijptra s>
Belemnilet impress us STANTON, in part (not GABB), U. S. Geol. Surv., Bull. 133,180S,
p, 84, pi. 20, fige. 3, 4; "Lower Horsetown beds," neighborhood of Ono, Shasta.
County.
Aaoleulkis impressa (Stanton) STOLLEY, FOBS. Catal., 1020, p. 207 (in part, STAXTOX,
U. S. Geol. Surv., Bull. 133, 1895, pi. 30, figs. 3,4).
Thia species is obviously distinct from "deJcmm'tes" impress us Gabb, and its
stratigraphie range in the Shasta aeries is lower. A comparison of many examples
from both the Cottonwood and McCarthy Creek districts confirms this view. In the
present species the guard is relatively thicker, and tho form is accordingly more
robust. The guard is heavy 7 , the sides nearly parallel for most of its length, but
tapers to a blunter point than in A. impressa (Gabb). The ventral groove is broad,
moderately deep, roundly concave at bottom, and extends downward nearly to the
point. The pbragmacone is circular in section, the sides forming an angle of about 19
degrees; the axis is somewhat central, but slightly nearer the ventral side of the
guard. Tbe holotype (Calif. Acad. Sci. type Coll.) was found at Locality 113 (Calif.
Acad. Sci,), near the head of Mitchell Creek, 4 mites southwest of Ono, Shasta
County. It has the following dimensions; length (incomplete), 152 mm.; greatest
diameter, 31.7 mm.; length of phragmaeone, 75 mm. The walls of the atveolus are
thin above, much thicker below. Good examples of the species were obtained on
the Middle fork of Cottonwood Creek, Shasta County, from Redbank Creek, Tehama
County, and from points farther south. This species appears to belong to .the group
of "Bclemnilca" mognificas d'Orbigny oa stated by Stanton (1895, p. 84). The holotype
was found with Polyptychitea shostenxis nov. and other species of thia genus
in the Hamlin-Broad zone of the Paskenta group.
Aerotevihis kernensis Anderson, n. ap.
(PTSTESD, EM" 5)
The guard of thia species ia of moderate size, nearly circular in scction; Sides
nearly parallel for much of its length, tapering in the lower one-third to an acuminate
point; ventral groove deep and broadly V-shaped, extending to the lower one-sixth
of the guard; ventral aurface flattened below; phragmaeone circular, central above;
axis inclining a little toward the ventral side; sides of phragmaeone forming an
angle of about 18 degrees, extending one-third the length of the guard. The holotype
(Calif. Acad. Sci. type Coll.) was found by G, D. Hanna and C. C. Church at
Locality 27605 (Calif. Acad. Sci.), in the west half of section 32, T. 26 S., R. 18 E.,
on the northeast slope of Orchard Peak, Kern County. This example represents the
lower two-thirds of the guard and shows no alveolar pit. It has the following dimensions:
length, 98 mm.; thickness, 20 mm.; total length (eat.), 140 mm. This species
is closely related to A, wiifc/ttWi nov. from the lower part of the Horsetown group
in the Cottonwood district, where both species have been found. It is more slender
than A. milekelli, the ratio of length to width is greater, and the ventral groove is