LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

202 LOWER CRETACEOUS DEPOSITS IN CALIFORNIA. AND OREGON
more gradually to the ventral border. A single constriction appears at a diameter
of 70 mm. on the last whorl of the lectotype, which is septate throughout, but this is
not found on all examples. The largest example found has a total length of ID
inches, more than half of which is formed by the somewhat straightened arm, or body
chamber.
This species has been found on the Cottonwood Creek (Locality 1353, Calif. Acad.
Sci.), and in the same zona on Eagle Creek, near Ono, where it was associated with
Acroteuihi* kernemie nov,, Neosratpediti* ovutia nov,, Shazticrioeerai ponienie, and
Itwceramtis cdlonicua nov,, all of which are found in the lowest beds of the Horsetown
group in the Cottonwood district. Hoplocrioctras remondi has also been found in
the middle part of the Horse town group in this district, in beds believed to be below
the middle of the Paskenta group, as at Locality 1665 (Calif. Acad. Sci.) on Duncan
Creek, at Silvester's ranch on the Middle fork of Cottonwood Creek, and on Dry
Creek, at about the same stratlgraphlc horizon. Its atratigraphic range in this
district ie from the lower or middle Paskenta group (Valanginian) to the middle of
the Horsetown group (Bedoulian). In the McCarthy Creek district, as recorded by
Stanton, its range may be somewhat more restricted, but it has been found in both
Paskenta and Horsetown beds.
JfopJflcW«er« anoen&t Anderson, a, sp,
(PLIUI S3, FIFFUR 3, a», 3b: PEATN HI, FLJPIM 4]
In the collection of the Academy of Xatural Sciences of Philadelphia there is a
fragment of Hopteicrioceraa, related to H remondi (Gabb), but possessing much finer
fiexuous costae, which are bundled on the dorsal border and have a section relatively
much broader. It is No. 12BSS (Phila. Acad, Nat. Sci.), and although it has tie
locality label the lithology, preservation, and association with other forms under
tbe same number indicate that it was found in the Ono zone, either on Eagle Creek
or on the Cottonwood Creak, near Locality 1353 (Calif, Aead. Sci.). The suture line
ia similar to that of H. remondi (Gabb). It bears the same number as a small example
of Crioeerat latum and also of Hoploerioceras remondi from the same place. The
holotype has the following dimensions; length, 45 nun.; height, 23 mm.; width of
whorl, IS nun. As seen on the periphery there are about 6 linear ribs to the centimeter.
These are slightly flexuous and nearly normal to the curvature of the periphery.
The suture lines are trifid, possessing long slender elements. No other example
of this species has yet been seen,
Hoplocrioceras mnlunium Anderson, n. sp.
(Pl»t« 60, flcun* J, 4)
Shell not large, coiling is first crioceratid, but later more openly, the whorl of
the body chamber departing from the earlier coil and forming a short curved shaft,
apparently not forming a hook; early coila not quite contiguous and gradually
Spreading; section of the whorls .sub-quadrate, narrowing toward the rounded
periphery; shell slightly excavated on the dorsal zone; costae beginning in a backward
sinus on the dorsal zone, curving upward in eroding the umbilical border,
slightly flexed on the side of the shell, somewhat swollen and often dividing on the
doreal border, or a little below the middle of the aide on the septate portion of the
shell; costae on the younger whorl nearly equal, but on the body chamber often
showing intermediary ribs on the upper part of the side; all costae crossing the
ventral zone without interruption, but slightly flattened; autuial characters not well
shown, but the septum beginning with a siphonal saddle somewhat rectangular in