LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

200 LOWER CRETACEOtffi DEPOSITS IN CALIFORNIA AND OREGON
from none so f&r known on the Pacific Coast. There is little satisfactory evidence
of the adoptability of these forms into any group already mentioned, although
possibly they could he included in Hemihoplitidaa Spath,
Uhlig (1903, p. 253-25S) has illustrated many hoplitid forms from the Valanginian
part of the Spiti shales, including some with reduced umbilicus, sinuous divided ribs
and peripheral bodes, as for esample Neccomite* malkeri and Ntocamilea aff. tcalktri
Uhlig. Such forms may possibly represent the progenitors of our crioceratid group,
and it may be that the parent stocks of these California types should be sought in
these distant regions.
However, for the present, the name Shasticrioccra* may be adopted for these
forms. The attention of students who may seek a more suitable name for them ia
here directed to the neocomitid characters of the species described under this name,
especially appearing in their forms, ribbing, and umbilical features, and especially
in the resemblance of the suture lines to those of Ntocomitcs aff, walkeri Uhlig (IOCS,
pi. 87, fig. Ad.).
Criotmaa LevciUe
Crioceraa latum Gabb
(Pht« if, fifui* 1)
Criocerax latum GABB, Paleont. Calif,, vol, 1, 1864, p. 70, pi. 14, fig. 25b; pi, 15, figs.
25, 25a: "near Weaverville, in the Trinity River: vol. 2,1869, p. 218—STANTOW,
U. S. Geol. Surv., Bull. 133, p. 17,18,83; Elder Creek district.
The holotype of thia species is in tbe Museum of Paleontology, University of
California, and baa been loaned for study and illustration. Gabb states that it is
very closely allied to Criocerat duvali Leveille, but as Gabb referred to the description
and figure given by d'Orbigny, which Kilian has renamed Crioctra* nelam,
Gabb's statement may be emended accordingly. Gabb stated that the holotype
had been obtained in the Trinity River "from a boulder," As Weaverville is not
very near any part of the Trinity River, and as no Cretaceous deposits are near the
town, the words "near Weaverville" may be interpreted to mean "near Douglas
City," where the river does approach such deposits, The "boulder" is a eandy concretion
and contains not only the holotype of this species but other identifiable
molluscan species, as Pecien operculiformig Gabb and a bivalve shell resembling
JVucula gabbi Stanton. This "boulder" may easily have been enrried down from the
Lower Cretaceous beds on Redding Creek, where various other Shasta apecies, including
Pecten optrculifarmis, Pleurotnya papyracea, and various cephalopoda, have
been found.
Stanton (1895, p. S3) reports the species from the Shasta series south of Elder
Creek, in beds here regarded as belonging is the Paskenta group, and also in the
"basal Horsetown beds" immediately overlying the Paskenta group.
The several examples referable to this species obtained by the writer were found
in the Cottonwood district, as on the North fork of thia stream above Ono; at Locality
113 (Calif. Acad. Sci.), 4 miles southwest of Ono; at Locality 1865, Duncan Creek,
and in the Paskenta group; at Locality 1353 (Calif. Acad. Sai.), and on Eagle Creek,
near Ono, which 1B in the lowest beds of the Horsetown group. The stratigraphic
range of the species is, therefore, nearly that of Hoploerioceras remondi (Gabb)—
that is, from upper Valanginian to Hauterivian.
Crioccrat duncanense Anderson, n. sp.
(Flat* 15, fltfif* 2)
Shell small or moderate in a Lie, aa known from the holotype; coiling crioccratid,
numerously ccstate, coils barely touching in young stages, more openly coiling