LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

174 lower chetaceous deposits ijf california and oregon
Acanihopliiei barryana Anderson, n. sp.
{PUlfl tl, 6(un« I, 1»)
Shell of moderate siae, sharply testate, latumbilicate; walls of umbilicus abrupt
below, rounded above; sides of shell flatly convex, periphery rounded; about 2B sharp,
elevated ribs, mostly of one order, occasionally branching a little below the ventral
border; interspaces broadly concave; ribs straight, apparently weakly spinose in
young etages.
The holotype (Calif. Acad. Sci. type Coll.) affords the following measurements:
greatest diameter, 110 mm.; diameter of umbilicus, 44 mm.; height of whorl, 40 mm.;
width of whorl, 30 mm.; umbilical ratio, 0.4:1,
The holotype waa found on Hulen Creek, in the upper part of the Horsetown group,
and seems probably to represent the Parrin zone of the Hulen beds. The species
appears to belong to the group represented by Acanthopliie) bigoureli (Seunes) as
interpreted and figured by Sinzow (1907, pi. G, figs. 4-6) from the Caucasus Mountains,
southwest Asia.
Acanthoplilet sub-bigaii Andewon, ft/ sp,
(Flats ft. fifun I)
Shell Btnall, discoidal, somewhat inflated, with roundly elliptical section of whorls,
about 52 generally prominent ribs, with sharp edges and with interspaces broader
than the riba; ribs arising on the umbilical wall, with a backward slant, crossing the
side in almost a straight line, or with a slight forward curve on the sides and on the
periphery; ventral zone slightly flattened on the larger whorl, shell bearing reduced
spines at the middle of tbe sides on the younger whorls. The holotype has the
following dimensions: greatest diameter, 40 mm.; width of umbilicus, IS mm.;
height of whorl, 16.5 mm.; thickness of whorl, 13 mm.
The Species shows a close resemblance to Aeanlhoplitea bigoti Seunes, from the
Caucasus Mountains, as figured by Sinzow (1907, pi. 4, figs. 18-20), of which it is a
near analogue. This example was found at Locality 955 (Calif. Inat. Tech.), in bads
of middle Aptian age on tbe Cottonwood Creek, near One, Shasta County, where it
was associated with DouviHeiceraa mammillatum, var. The holotype is the property
of the California Institute of Technology, and was found by W. P. Popenoe and
D. W. Scharf.
DotrviLLEicEBAiriDAH Spath, 1021
DouviUeiceras Crossouvro
Genotype Ammonita mammillatui Sohlotheim
DouviUeicerat off. tnanimtiialtim (Schlctbeim)
[Plata 34, flcu»3)
Acanlhoarraa cf. mammillare STAWTON, Geol. Soc. Amer., Bull., vol. 5, 1891, p. 446;
upper Horsetown beds, Shasta County, California,
DovviUcicerai mammillare ANDEII&ON (in part), Calif. Acad. Set., Pr., 3d scr., vol. 2,
1002, p. 106; Hulen Creek, Shasta County.
Spath (1921-1922&, p. 08-73) has given much critical information concerning the
English and French species referable to this generic group. This information aids
in tbe study of the relationships of the California forms found in the Albian strata
of the Cottonwood district. Of these there is a good number of examples available,
not all of which seem referable to a single species. Some of these examples come
within the range of variation indicated by Spath, others do not.