LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

220 lower cretaceotffi deposits in california and oregon
divisions, in part single; branching riba bearing tuberculate nodes at points of
division more prominent than on the larger limb; section of limha subcircular, Battened
on the dorsum, where the ribs bend strongly forward; septa only imperfectly
shown, sutures similar to those of Ilamulina. Insofar as the body-chambers indicate,
this species has characters similar to 4, ("fiamutina") larioli Uhlig, described
from the Wernadorfet beds of the Carpathian Mountains, eastern Silesia. Aa Hyatt
included this apecies in Anahamvlina, its California analogue should also he
admitted.
In form this species is somewhat more robust than Uhlig'a, the costae are heavier
and leas numerous, and the costal nodes are more prominent on the smaller limb,
whereas i n TJhlig's species they are more prominent on the larger limb. The holotype
(Calif. Acad. Sei. type Coll.) has the following dimensions; width of body-chamber
across both limbs, mm,; dorso-ventrat diameter of larger limb, 21 mm.; diameter
of smaller limb, IS mm.; holotype found 3 miles southwest of Ono, Shasta County.
HETE&OCERATIDAE Spath 1924
SemUmcuiiles Hyatt 1369
Genotype, "Toxoeeras" obliquatum d'Orbigny
No formal description ol this genua has been found in the literature, but, aa the
genotype ia sufficiently characterized and distinctive, a further description may
have been thought unnecessary by the author. D'Orbigny makes no statement as
to the early stages of the species or to a retrovers&l body-chamber, if such esiated.
Few other writers aeem to have recognized forma of this group, although it seems to
have been well represented in Europe, In the Lower Cretaceous sequence in the
Cottonwood district, Shasta County, various distinct species have been found,
apparently referable to this genus, the earliest appearing in beds thought to be Barremian
(upper "Heteroceratao"), and others at higher levels. These several forma
differ much in size, form, surface markings, and other characters, as well aa in the
horizons of their occurrence. All occur below the top of the Cottonwood Beds
(Aptian) and therefore range from Barremian to middle or upper Garganian.
Hemibaculites mirabilis Anderson, n. sp,
{FUta Tt, Giurw }, 2K 3)
Ancyloceras (sp. indet.), GABB, Paleont. Calif., vol. 1,1861, p. 78, pi. 16, figs, 30, 30a;
Cottonwood Creek, Shasta County; (not "C." (Aneyloccras ?) flemondt GABB,
Paleont. Calif,, vol. 1,1B64, p. Tfi).
Gabb's confusion of this species with Hoploterioceras remondi (Gabb) seems surprising,
even though there is some resemblance in the character of the septum. The
species here described ia quite distinct and is not closely related to H. remondi
(Gabb). This form is the largest of the four or five specie? of the genus found in
the Horse town group in the Great Valley embaymant deposits. The holotype of
the apecies has not been recognized, although similar examples are in the Museum
of Paleontology, University of California, and others have been found in the field.
According to Gabb's statement, the fragment from which hie drawing waa made
measured 6 inches in length and 2.25 inches in greater diameter. A fragment with
nearly these dimensions was found at Locality 1347 (Calif, Acad. Sci.), eaBt of
Mitchell Creek, associated with PAjrlfoeenja onoense, BeltmnoUuihit paeifiea nov.,
and Lytoeeras argenautarum (Anderson) in the Argonaut zone, about 200 feet above
the Barr conglomerate, and 100 feet above the zone of Tropaium percontalum, The
figured example was found by W. P. Popenoe and D. W. ScJiarf half a mile farther