LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

152 lower chetaceous deposits ijf california and oregon
constrictions and growth lines; suture line lyto-ceratid, but not welt shown on the
holotype; species plentiful in the Neptune zone at Locality 1659 (Calif, Acad. Sci.)
on the east branch of Hulen Creek, Shasta County.
The holotype (Calif. Acad. Sci. type Coll.), an adult shell, has the following
dimensions: greatest diameter, S3 mm.; width of umbilicus. 24 mm.; height of whorl,
40 mm,; width of whorl, 30 mm.; umbilical ratio, 0.298:1.
In its older stages the shell develops transverse undulations, not unlike those of
Gaudryetraa saeya (Forbes), which may indicate either relationship, or developmental
tendencies. These undulations do not appear until the shell reaches a diameter
of $M> mm, At this stage the section of the whorl becomes slightly flattened on
the sides and ventral surface, approaching an elliptical form.
Ten good examples in all were obtained at Locality 1650, associated with Beudanlicera*
brewer* (Gabb), Besmoeeroj merriami (Anderson), and Do-uvillciccras
mammillatum, var.
Lylocera* (Gaudrycera* ?) neptunium Anderson, n. sp.
[Pt&ta 19, l|gn 1}
Shell very large, thick, and heavy; whorls few, increasing rapidly in cross-section
and size; umbilicus wide, involution moderate; whorls rounded, broader than high;
surface ornamented only by simple, rounded costac, about 10 to 11 to an inch on
the body whorl (2.3 mm. apart), separated by narrow interspaces; site and weight of
fossil excessive compared to other California species. The holotype of the species
(Calif. Acad. Sci. type Coll.) has the following dimensions: greatest diameter, 16.5
inches (420 mm.); width of umbilicus, 7.3 inches (185 mm,); height of whorl, 7 inches
(178 mm.); width of whorl, 7.9 inches (193 mm.); umbilical ratio, 0.440:1.
The Bpecimen is incomplete, the body whorl being detached from the coil, which
is intact. The suture line is entirely unknown. With the body-chamber attached
the diameter of the whole measures 22 inches. TIUB specimen was obtained at
Locality 1659 (Calif. Acad. Sci.) on the east branch of Hulen Creek, where It waa
associated with many forms already mentioned. It is the laxgeat cephalopod species,
in point of weight, yet found in the Cretaceous of California, exceeding the dimensions
of LylQeeras talurnale, whose holotype Gabb claimed to have been tbe largest.
The stratigraphic horizon is that of the Neptune zone, assigned to an upper middle
Albian position in the chronological scale.
Lylnctrae (Konmatdla) whitneyi (Gabb)
(Flat* SI, Scum 1, 2)
Ammonites Whitmyi GABB. Paleont- Calif., vol. 2, 1869, p. 134, pi. 22, figs. 14, 14a,
14b; "Shasta Group/ 1 Cottonwood Creek, Shasta County.
Few examples of this species have been found in the California Cretaceous, and it
has not been recorded from any other West Coast area. The holotype is in the Museum
of the Academy of Natural Sciences of Philadelphia, and by the courtesy of Dr.
H. A. Pilsbry, loaned for Btudy and comparison. A fairly well preserved specimen of
the species has been found in tho upper Hotsetown beds on Dry Creek, northern
Tehama County, associated with species of upper Albian age. In its early etages of
growth the whorls have slightly greater involution than any other lytoceratid
described herein. Below a diameter of 23 mm. tbe whorls are nearly circular in
section, with abrupt umbilical walls and nearly smooth surface. At a diameter of 40
mm. the form begins to change, the height becoming greater than the width, and
undulations begin to appear on the sides and ventral surface; at a diameter of 100
mm. the ratio of height to width of whorl is about 10:9, and with further growth