LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

DESCRIPTION OF SPECIES 99
INOCB&AHIDAB Heinz
In this family Heinz (1632, p. 5, A) includes the great majority of the sub-families
and new genera he has proposed for the Inocerami of earlier usage. However, aa
his proposed classification, and most of his past studies, have had to do only with
Upper Cretaceous, forms (Cenomanioq and later), their application to tho alder
Cretaceous forms remains somewhat uncertain, and accordingly no attempt is made
at present to adopt either hia methods or his taxonomy.
Inoceramwt Sowerby
Inocetamut Genius Stanton
tPtat* i, fiirwfl)
Imctramw etmtua STANTON, U, S. Geol, Surv., Bull. 133, 189fi, p. 47, pi. 4, fig. 15;
South fork of Elder Creek, Tehama County.
In general form and surface markings this shell is not unlike i. eliioti Gabb, and
represents a low position in the Paskenta group. Its sub-triangular outline, sharp
beak, and short hinge line are among its distinguishing features, and ia these it
apparently conforms to the type of /. ellioli. Stanton regarded it as belonging in
the "upper Knoxville beds," which in this memoir constitutes tbe Paskenta group
of tho Shasta aeries. The species has recently been found in the Paskenta group
on the Middle fork of Cottonwood Creek, where it was associated with Hoplocrioeetaa
remandi (Gabb), a form moro frequently found in tho Paakenta group, but
occurring also in the basal Horsetown,
Inoceramua eliioii Gabb
[Plata 1, Sgan I)
Inoceramvi rlliotf GABB, Paleont. Calif., vol, 2,1369, p. 193, pi. 31, fig, 60; Alcatras
Island, Bay of San Francisco—STBWAHT. Phila. Acad. Bci., Spec. Publ. no. 3,
1030, p. 106, pi. 2, fig. 2; later figure of the holotype,
Tbe holotype of this species is in the Museum of the Academy of Natural Sciences
of Philadelphia and has been re-figured by Stewart. It consists of an incomplete
cast of both valves, somewhat distorted by an oblique fault, as shown in Stewart's
figure. The effect of this fault has been to shorten and also broaden its original
form, and the apex of tbe beak is missing, so that Gabb's figure is misleading aa to
form. At the time Gabb's figure was made the holotype was in little better condition.
The holotype ia accompanied by a second fragment of a right valve, possibly
representing the same species, and bath may have been used in Gabb's attempted
restoration. The outline of hie figure could hardly have been made from the holotype,
but as he himself says, it was made "from a cast (or mold) in sandstone."
Gabb afterward obtained from tbe same place "casts of this and several other bivalves,"
one of which its described in another place aa Lueina alcalTazis nov. The
holotype of /. eliioti has the following dimensions: length of left valve (incomplete),
85 mm.; greatest width, 08 mm.; thickness of both valves, 30 mm. A drawing made
from the holotype (PI. 7, fig. 1) is more accurate. In form and size, if not in sculpture,
it resembles mature examples of Inoterarww oveftts Stanton, and belongs to its
group, and also its horizon. It seems to be also closely related to /. quatsinaensU
Whiteavea.