LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

214 loweR cretaceotffi deposits iN california and oregon
more inflated, the early ceil is broader and more developed, and the riba on this
portion of the shell are strong and rounded and terminate on the ventral border in
clearly visible ventrolateral nodes- The ventral surface of the coil is flattened;
with growth the ventral side becomes more rounded, the costal nodes disappear, and
the ribs become more numerous and fainter. The early whorls are more nearly of the
typo shown in bsfcsimXft, figured by Gabb (1899] pi. 24). In section of whorl, shaft,
and body-chamber the present species ia less inflated, is smaller in size, and tbe bucal
limb is broader and lees heavily ribbed. The holotype is the property of the California
Institute of Technology and has the following dimensions: total length of
shell, 18-5 inches; total width of shell (both limbs), 11 inches; greatest thickness, 3,4
inches; greatest diameter of bucallimb, 4.7 inches; lesser diameter, 3.9 inches. This
example was found by W. P. Fopenoe and D, W, Scharf on Roaring River, immediately
beneath the conglomerate of the Barr sane and not far above the top of the
Mitchell zone, east of the Millsap road. Its position marks the lowest known occurrence
of thia genus in tho Cottonwood district.
ShatlotxTat behemoth Anderson, n. sp.
(Fl»t« Jfl, fisura I: plita 7T, ftfttis 45
Ancylocerae percoelatus GABH (in part), Paleont. Calif,, vol. 2, 1863, p. 138, pi. 24, fig.
19 (not "C rioter as percoelatus Gabb, vol. 1,1364, p. 77, pis. 16,17; Cottonwood
Creek).
This remarkable species was known to Gabb, although he confused it with Tro-
!>