LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

DESCRIPTION OF SPECIES 205
m referable to tbe family of Hemihoplitidse Spath, although it shows no tendenny
toward a bundling of the riba on the dorsal border, aa is found ia Heplacriacera*
remtmdi (Gabb).
JShasticriocerai whilneyi Anderson, n. sp,
(Fists IS, Stun 1)
Shell of moderate size, coiling at first crioceratid, whorls apparently not contiguous;
with growth, leaving the early coil and forming a broadly curved limb in
one plane; section of whorl narrowly quadrate, twice as high as broad; sides sloping
gently toward the periphery, more abruptly toward the dor&um; sides costate, having
mostly simple, sometimes branching, rounded, slightly flexuoua ribs without pronounced
tubercules; having only small rounded swellings on the ventral border; ribs
arising on tho dorsal side in a small forward sinus; sides crossed by & few brood
grooves between which there are about eight intervening costae; ventral zone narrowly
rounded or slightly depressed along the siphoual HUB; sides a little convex;
septa not well exposed, but the first lateral lobe is asymmetrically tripartite, saddles
deeply cleft. This apecies is undoubtedly congeneric with SAasWerioeerw kesperum
hut is smaller and has a mors open coil, mors compressed section, and simpler, mora
rounded costae. The holotype (Calif. Acad. Sci. type Coll.) was found at Locality
1963 (Calif. Acad. Sci,) near Mitchell Creek, half a mile northwest of Barr's antral,
by G, D. Hantifi. Its horizon Is near that of Locality 1661 (Calif. Acad. Sci.) and a
few hundred feet beneath the Mitchell acme containing its congener, 5. ftwperum.
Of the species here described under this genus the present one has the more open
coil in its younger stages. AD example, less than an inch in diameter, possesses
fine tubercules on tbe ventral border and has somewhat more flexuous ribs than
those of the holotype.
Shaaticricceraj inflatum Anderson, n. ap.
{Fltt« », firm* a, I; plat« M, Opens 4)
Various fragmentary specimens, representing a distinct form of this genus, found
in or near the Mitchell zone, have a broader and more rounded section than any of
the preceding forms. The fragment selected for the holotype consists of a quarter
of a complete whorl, septate throughout and having tbe following dimensions: total
length, 118 mm.; measured on the periphery, 135 mm.; maximum height, 48 mm.;
maximum thickness, 33- mm.; section of whorl semi-elliptical, the greatest width
being at about one-third the height above the dorsum; about 20 ribs on the holotype,
low, rounded, and scarcely flexuous; only a few are divided on the outer One-third
of the aide. Tbe ventral zona is a little flattened, but not cukate; ribs only faintly
tubcrculate on the ventral border. The species ia probably more closely related to
S, -poniente nov. than to any of the Other forms described but it is relatively broader
and is not flattened on the sidts or on the dorsum. The holotype (Calif. Acad. Sci.
type Coll.) was found in the Mitchell zone at Locality 1347 (Calif. Acad. Sci.), 6
miles south of Ono, Shasta County.
Pieudacrieetrat Spath 1024
Genotype, "Crioctras" abichi (Bacevic and Simonovic) IN AKTHTTLA,
Bei.tr, zu Pal., Geol. Oeet, Ungarns, vol. 12, 1899, p. 124, pi. 12
Spath has proposed this generic name for ammonoids of the group of "Otoceras"
fflfciefii, giving no further characterization, if one may judge from the figure and
description giren'by Anthula, the shell is large or massive, clo&aly coiled in its
younger stages, having a somewhat elliptical or euhquadrate section; heavily costate