LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

134 lower chetaceous deposits ijf california and oregon
A-FOBRHALDAE Phllippi
Anchura Conrad
AneAure biangulata Anderson, n. sp.
(Pl&taS, fi«qrca 4,1, 6)
AporrAats angulata GABB (in part), Paleont, Calif., vol. 1, 1864, p. 128, (not pi. 20.
fig. 84; BUD'B Head Point),
Anchura ? anguiata (Gabb). STEWAUT, (in part), Phila. Acad. Nat. Sci., Pr., vol. 78,
1926, p. 361 (not pi. 22, figs. 4, 5).
In bis description of "Aporrhais" aneulata (1864, p. 128), Gabb stated tbat:
"Mr. Brewer collected three specimens at Huliog Creek, near tbe Cottonwood
Creek locality, resembling this specics in surface ornamentation, and in the shape of
the upper whorls, but in which the last whorl was dietinotly biearinato."
This locality has been unsuccessfully searched for Gabb's specie*, although a
number of distinctly blcarirjAte examples of a larger species have been found which
In other respects agree with the form indicated by Gabb. The angular ridges on tbe
body whorl completely encircle it, the more prominent upper ridge passing outward
into the wing, or outer lip expansion; tbe lower one becomes lost. The whorla of
tbe spire are not rounded, as in Aiuihura angvlata, but for the most part are angular
in section parallel to the axis; these whorla bear 3 to 10 vertical ribs, or varices,
which are crossed by numerous revolving threads.
The holotype (Calif. Acad. Set. type Coll.) is incomplete as to spire and canal,
and measures as follows: height, 57 mm.; width of body whorl, 22 mm.; aperture
distinctly triangular in outline. The wing, as shown in the paratype, (Calif. Acad.
Sci. type Coll.), rises obliquely from the upper part of the aperture in a broad curve,
and at its outer end forms a distinct expansion. This expansion rises into an acuminate
point not quite parallel to the axis of the spire and terminates below in a distinct
spur. The canal is long and nearly straight; height of paratype (incomplete),
57 mm.; width of body whorl, 22 mm.; outer margin of wing, from end of spur to
terminus of upper point, directed slightly backward. This species has been found
not only in the Perrin zone of the Hulen beds, on Hulen Creek (probably Brewer's
locality), but also in the basal beds of the overlying Chico series on Cottonwood
Creek. The holotype and also the paratype came from the latter horizon, at Looality
1346-A (Calif. Acad. Sci.). Most of the examples found here were firmly cemented
in tho matrix of a conglomerate and could not be extracted without breaking. Anchura
bian^uiala, nov. appears to have survived the epoch of disturbance between
the Shasta and Chico series, whereas Ant Aura angulala (Gabb) has not been found
in the Shasta series and may be confined to tho later group.
Tcssarolax Gabb 1864
Tes&arolax bicarinaia (Gabb)
Helicaulax bicarinata GABB, Paleont. Calif,, vol. 2, 1869, p. 166, pi. 27, fig. 47;
"Shasta Group," Cottonwood Creek, Shasta County, (not Roalellaria bicarinata
Deshayes)—STANTOK, U. S. Geol. Surv., Bull. 133, 1895, p. 72; Horsetown
beds, Cottonwood Creek, Shasta County.
Tetsarolax bicarinata (Gabb), STEWART, Phil a. Acad. Nat. Sci,, Pr., vol. 78, 1928,
p. 304, pi. 23, fig. 6; holotype figured.
Stanton (1395, p. 72) wrote that
"The whorla on the spire are distinctly angular, instead of plane, as shown in
Gabb's figure."