LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

description of species 133
Maude Island (Queen Charlotte Islands), from beds that have been thought to
belong in the Haida group, which apparently is much younger than those at Ono.
Nerinea sp. undet.
(PUL* 9, FI«UN» 3,1)
Shell small, spire short, relatively thick, turreted as in the preceding species,
although sloping more rapidly to tbe apex; basal part not known. This species
occurs with the preceding at Locality 1353 (Calif. Acad. Sci.) in the Ono zone, near
tho baae of the Horsetown group on the Cottonwood Creek, Shasta County. Because
of the rarity of the genus in tbe Cretaceous of California, this form is here
recorded with the preceding.
"Nerinea" dispar Gabb
jVerinfo dupar GABB, Paleont. Calif., vol. 1, 1864, p. 113, pi. 19, figs. 63, Gfla; North
fork of Cottonwood Creek, Shasta County; vol. 2,1869, p. 231, "Shasta Group."
Cottonwood Creek—STEWAM, Phila. Acad. Nat.ScL, Pr,, vol. 78,1926, p. 322,
This species seems not to bave been recognized by later writers, and there is no
record of its occurrence in the Shasta series other than that given by Gabb, The
holotype is in the Museum of Paleontology, University of California. Stewart
gives its dimensions as follows: length (incomplete), 55 mm.; width, 13.5 mm.
According to Stewart (1926, p. 322) it is "related to 'Cltmtcala' dtmenlina
(d'Orbigny) from the Cretaceous (Albian) of Europe."
A similar form, although much smaller than Gabb's species, has been found in
the lower Chico beds of Middle fork of Cottonwood Creek.
CEIUTUIIDAE Menke
CEN'FHTUM tlrigotum Stanton
Ctrithium ttriaoaum STANTON, U. S, Geol. Surv., Bull. 133, 1895, p. 71, pi. 13, fig. 7;
Shelton a ranch, 5 miles north of Paskenta, Tehama County.
"Shell small, slender, consisting of nine or ten rounded whorls, surface ornamented
by narrow, elevated, transverse eeatae and by revolving line*., There are
eight coetae on each whorl, so arranged that they form continuous varices the full
length of the shell. Pour of the revolving lines are visible on the spire.
"Height, G mm.; greatest breadth, 2 mm."
The list of species (Stanton, 1SG5, p. 18) containing this form contains also Apatite
cratiicallis, "Olcotltphanua" mulabilis Stanton, "HoplUe*" angulatut, and other
species characteristic of the Paskenta group.
Potamide* diadema Gabb
Potamuto diadema GABB, Paleont. Calif., vol. 1, 1864, p. 130, 227, pi. 20, fig. 85;
North fork of Cottonwood Creek, Shasta County; vol. 2, 1869, p. 227; "Shasta
Group," Cottonwood Creek—STANTON, U, S. Geol. Surv,, Bull. 133, 1895, p.
13; lower Horsetown, North fork of Cottonwood Creek—STEWART, Phila.
Acad. Nat. Sci., Pr., vol. 78,1926, p. 356; Locality and horizon as above.
This specieB tB abundant in the lower beds of the Horsetown group of the Shasta
series.
It has been found abundantly in the beds exposed near tbe bridge at Ono (Locality
1353, Calif. Acad. Sci.), where it ia associated with Neocrasprdilee aguila nov.,
Acroleuikii kerrunsii nov., and Inaceramus colonicus nov.