LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

DESCRIPTION Of SPECIES 192
may be added Puzaria onona nov. at tbe tap of the Horsetown group. Both have the
flattened, disccidLat form, email umbilicus, and faintly impressed constrictions of
Pmona communis Spath, some of the forma of which they resemble (Spath, 1922a,
figs. 3a, 3b).
Piuoria 6u«wprn(«ro Anderson, n. sp.
(PltM 44, firm J; ptet* 41, tium I, S)
The shell of this species is rather large, section of whorl subeircular, umbilicus
broad, walls of umbilicus abrupt below, rounded above to the curvature of the
inflated side; surface of side marked by seven at eight sinuous transverse grooves
which arise on tbe umbilical wall and cross, the ventral area with a moderate forward
swing; sides costate between the grooves with about 20 rounded, sinuous costae often
dividing near the middle of the fide; suture line resembling that of P. hoffmanni
(Gabb). In its older stages the ribbing on the body whorl changes to a different
type, developing strong and nearly straight ribs, separated by concave interspaces
20 to 3fl mm, hroad, showing only irregular lines of growth. The holotype (Calif.
Acad. Sci. type Coll.) was found at Locality 1JM-A (Calif. Acad. Sci.) the west
branch of Hulen Creek, a mile above its mouth, associated with Douti'iteicenw rooromiUutam
var., and other forma of Piuasta. The septate portion of the holotype
has the following dimensions: greatest diameter, 105 mm.; width of umbilicus, 40
mm.; height of wborl, 36mm.; width of whorl* 41 m ; umbilical ratio, G,3B1:1. The
body-chamber occupies at least two-thirds of a whorl; with tbe body-chamber
attached the diameter of the entire coil ia 160 m This species is believed to belong
exclusively in the Buenaventura zona at the bottom of the Hulen beds in thisdifrtrict-
It has been found at tbe same horizon on Alderson Creek, 3 roilee south, of Ono, and
fragmentary examples have been found on Dry Creek, west of Rosewood.
Putotia diUeri (Anderson)
(PlMaia, Ifurtt 1.1,1; pta« 40, Spire II
Demweeras diUtti. AJTDEBSOK, Calif. Aead. Sci,, Pr., 3d «er., vol. 2,1902, p. 97, pi. 4,
figs. 116,117; pi. 10, fig. 192; Cottonwood Creek, Shasta County.
This species ia rather large, diacoidal, a little compressed; umbilicus broad,
not deep, walls abrupt below, rounded above, merging with tbe rounded aides;
section of wborl broadly semi-elliptical, with, tides tending to converge toward the
periphery; surface marked by aix slightly sinuous, shallow grooves which arise on
the umbilical walls and wees the ventral area with only a slight sinus; interspaces
between tbe grooves occupied by IS to 30 low, rounded costae; suture as shown.
The holotype of this species is in the Museum of Paleontology, University of California.
It is wholly septate and haa the following dimensions; greatest diameter,
IIS nun.; width of umbilicus, 45 mm.; height of whorl, 45 mm,; thickness of whorl,
46 mm.; umbilical ratio, 0.391.1. This species is intermediate in form, surface
ornamentation, and stratigraphies! position, between P, butnuvenluTa and P. hajfraanm
(Gabb). It is not unlikely that the line of descent includes the three forma;
this line may terminate above in P. jimboi nov. (=• Puxotia wMioteaf Smith, not
Jimbo), The holotype of P. dt'Ueri waa found by the writer on the east branch of
Hulen Creek, about 400 feet beneath the Perrin z