LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

description of species 189
et«r» 30 mm.; width of umbilicus, 8 mm,; height of whorl, 12 mm.; thickness of whorl,
10 mm.; umbilical rate, 0.267:1. The paratypa (Calif. Aead. Sci. type Coll.) measures
: diameter, 15 mm.; thickness of whorl, 4 mm. Both of these examples were
found in 189B at Jackass Flat, a mile east of Horsetown, Shasta County, and were
among those recovered from tbe San Francisco fire cf 1W0, This species resembles
Puzosia diadenut, from the Buenaventura zone, and it may be regarded as a lineal
successor from it.
Puzomo wtaveri Anderson, n. sp.
HPiste 41, tout
Shell small, discoidol, compressed, and numerously costate ; umbilicus relatively
broad, walls not abrupt, but rounded on the border, curving to the convex sides;
sides marked by about five transverse, shallow goovea, inclining forward and crossing
the ventral area with a forward sinus; interspaces between grooves occupied by
eight to ten rounded coatae, separated by equally broad rounded hollows; section of
whorl narrowly elliptical; suture line deamoceratid, although not completely exposed.
The holotype of the species is in the Museum of Paleontology, University of
California, and was loaned for fltudy and description through the courtesy of Dr.
B. L. Clark, to whom the author is indebted for information as to its occurrence.
It is well preserved in part, and has the following dimensions: greatest diameter,
nmii ; width of umbilicus, 19 mm,; height of whorl, 30 mm-; thickness of whorl, 20
mm.; umbilical ratio, 0.345:1. This example was found at the Fernandez tunnel
on the Santa Fe Railroad, about 3 miles east of Rodeo, Centra Costa County. Its
horizon is not yet definitely known, but it is presumably from beds of upper Horsetown
age, although they may be younger. Tho beds appear to be nearly equivalent
to those southeast of Crocket, from which a large fragment of Acanthoplitet has been
obtained. The species is named for Dr. C. E. Weaver, in recognition of valuable
contributioni) made to the geological and paleontologies! literature of California and
of ether western States. One or two additional ammonoid species of upper Morsetown
age have been reported from tbe neighborhood of this tunnel.
Beudaniictrat Hitzel
Beudanticera* breweri (Gabb)
{PI«I» 43, ficura 1; pl&t* Spira 1,3)
Ammanilex BrvWti GAUD, Paleont. Calif., vol. 2, 1609, p. 130, pi. 30, fig. S; pi. 19,
fig. fib, only, (not figs, 6,6a); Cottonwood Creek, Shasta County.
Demweeras oremen" STANTON, Geol. Sec. Am., Bull., vol. 5, 1894, p. 446; Horsetown
BEDS—(7) WIIXTEAVXS, Geol. Surv, Canada, Mes. FOBS,, vol. 1, pt. 4, 1900, p.
2&4|Maude Island—AjrpBBaos, Calif. Acad. Sci,, Pr., 3deer„ vol. 2, 1902, p.
62; Horsetown Beds, Shasta County.
Gabb's (1894, pi. 10) original figure and description of this species were quite defective,
and he apparently abandoned them. In the second volume of his work (Gabb,
ISdQa), he gave a new figure and an emended description which better represents the
species. The holotype ia in the collections of the Academy of Natural Soiencea of
Philadelphia and was l oaned for re-figuring and description, through the courtesy of
Dr. H. A. Pilsbry. The species is abundant in the upper part of the Horsetown group
ou Hulen Creek and on the Xorth fork of Cottonwood Creek. Many examples of all
sizes belonging to this species were collected at Locality 1650 (Calif. Acad. Sei.) in the
Neptune zone on Hulen C reek and also at the old mining camp at Horsetown, on Clear
Creek, Many examples of the species are in the Museum of Paleontology, University
of California, and others are in the collections of Stanford University. With