LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

201 LOWER CRETACEOtffi DEPOSITS IN CALIFORNIA AND OREGON
other, Thia difficulty is in no way clarified by the taxonomic record of tbe leading
species of the group—namely, Sojijwraita e&cramcntica—originally described aa
"Pachydiicug" aacramenlicua Anderson. Spath (1922, p. 125) noted thia evident
error and has referred the species to "Pteurvpachy discus" Hyatt, which appears to
be a nomtn nudum. The genotype of thia proposed group is the "thicker form"
described by Gabb (1869a, p. 131) aa Ammonite* hoffmanm, a species, found in a
higher horizon—the upper-middle Albian—which has little relation to Sonncraiia
jaeromeniico.
Sonneratia socrameniica (seq.) bears evidence in its younger stages of being
strictly congeneric with the following apecies placed under the genus; it also seems
to belong to the group of "UhligeUa" SaJmensis (Jacob), aa already indicated. The
views of Spath (1923, p. 36,36) seem to be illustrated by the following texts:
"Since Farahoplitidoe and Hcplitidae are considered to be trachyastracoua
developments of Desmoceratidae, it may be convenient on account of their tuberculation,
to remove from Desmoceratidae the genus Cleonicexas (with which is included
"UhiifftUa" Jwlmctm* (Jacob)), and Sonneratia, though they are directly connected
with "VfUisella," and Beudaniicera*, and show tho same type and variability of the
suture-line aa does Deamoceras «. ». (>» "Latidoraella," Jacob)."
"Certain Aptian PUwopuchydiecvs are often wrongly referred to "Latidoraella," ?
i.e., Desmocera* t. a."
Thcso views seem to be somewhat modified ia a later paper, from which we learn
in his discussion of Clconiceras baylei (Spath, 1925, p. 93):
"The species is included in Cleotticeras rather than in Sonneratia on account of the
smoothness of its adult stage and the disappearance of the ribbing on the venter. It
probably represents a direct development of "Uhligella" balmetmi (Jacob) which is
tar more strongly cost ate, and might with propriety be Included in Sonneratia,
although its suture-line is still in tho 'Detmoceras' stage."
SoTineradto perrinsmithi Anderson, n. sp.
(Ftata 81, fljitn* 11, ft, 7>
Shell of moderate size, discoidal, moderately compressed; umbilicus not broad,
with somewhat abrupt walls, slightly angulated on the border; sides slightly flattened
or flatly rounded, numerously costate; coatae "prorsiradiate," branching
above the middle of the side into two or three rounded ribs, curving strongly forward,
and crossing tbe ventral zone with only slight weakening, aa seen on tbe cast; tubercules
on the umbilical borders much reduced.
This species is distinguished by its greater number of ribs and by the method of
their branching; there are about 82 ribs at the ventral border. The ventral zone is
rounded or only faintly flattened in the younger stages. The holotype (Calif. Acad.
Sci. type Coll.) 1ms the following dimensions; greatest diameter, 100 mm.; width of
umbilicus, 35 mm.; height of whorl, 32 mm.; umbilical ratio, 0.35:1. This specimen
was obtained at Locality 162 (Calif. Acad. Sci.) on the east branch o( Hulen Creek,
associated with Sonneratia sacramentica and 5. (ajfi nov., and Douvillciceras mammillatum
var. at a horizon about 9Q0 feet below the top of the Hulen beds of the
Horsetown group. Its horizon appears to be middle Albian.
Sonneratia taffi Anderson, n. ap.
CPl«tO it, fifUTM 4. 5)
This species bears some resemblance to S. pcrrtwmilJii but is smaller, has a smaller
umbilicus and only about £6 to 60 costae; ventral zone smoother and leas strongly
costate than the preceding; suture line only imperfectly shown on the holotype.
The horizon of this specics is that of the Perrin tone, at Locality 152 (Calif, Acad.