LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

description of species 123
zone, on the east branch of Hulen Creek, and therefore somewhat higher in
the section.
TELUNIDAE Dcehayes
Tellina Linnaeus
Tellina (Areopagia) iekama Anderson, o. sp.
(Pl»t« 7, figiiro) 3, 3*}
Shell rather large, oval in outline, slightly inequilateral, apparently incquivalve;
shell only moderately inflated, thickest in the area below the beaks; lower margin
broadly rounded, curving broadly in front, somewhat narrowed and angular behind;
beaks sub-central, a little behind the center; hinge AS shown in the figure, vrith long
laterals, tbe left valve bearing two cardinal teeth; surface of shell marked only by
concentric growth lines; beaks small, curving slightly inward and forward. The
holotype (Calif. Acad. Sci. type Coll.) measures as follows: length, 85 mm.; height,
62 mm.; thickness of left valve, 15 mm. The shell somewhat resembles Areopagia
circinalia d'Orbigny, from the upper Cretaceous of France, but it belongs to a lower
horizon, probably Cenomanian. This example was obtained from the zone of Pervinquieria,
n. sp. in the lowermost Chico group on the Middle fork of Cottonwood
Creek, Shasta County. The same species has also been found in the uppermost beds
of the Horsetown group, a few miles to the south, on Dry Creek, just beneath the
basal beds of the Chico group, Tehama County.
COASCIIIDAB Fleming
Corbvia filoza Stanton
Cotbula f&aea STANTON 1 , U. 3. Geol. Surv,, Bull. 133,1S95, p. 62, pi. 11, figs, 1, 2; near
Stephenson's on Cold fork of Cottonwood Creek, Tehama County.
"Shell small, oval, convex; beaks rather prominent, a little in advance of the middle;
cardinal margin sloping almost equally from the beaks in front and behind;
anterior end regularly rounded and narrower than the posterior end, which is also
rounded, but more prominent above than below; ventral margin forming a broad
curve; surface marked by slender filiform concentric lines, with somewhat broader
interspaces. Some examples show an ill-defined subangular umhon&l ridge extend isg
from tho beaks to the postcro-basal margin. Length of a large specimen, 19 mm.;
height, 13 mm.; convexity of single valve, about 7 mm."
No other species of Corbula had previously been reported from the Lower Cretaceous
of California.
The name of this species occurs without question aa to its determination in the
list given by Stanton from its type locality, The horizon is regarded as within the
Paskenta group of the Shasta scries; found also in the lowest beds of the Horsetown
group near the bridge on the North fork of Cottonwood Creek.
SAXICAVIDAE Gray
Panope Menard
Panopc conecntrica (Gabb)
Pancpaea amcentrica GABB, Paleont. Calif., vol. 1, 1864, p. 148, pi. 22, fig, 119;
Cottonwood Creek, Shasta County; vol. 2, 1869, p. 236 (in part, not
"Homomya" concmtrica-, Cbico Group).
Gabb'a original description is in part as follows:
"Shell Bubquadr&te, about a third longer than wide: beaks small, about a third
of the length from the anterior end; posterior cardinal line very slightly sloping;