LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

98 LOWER CRETACEOUS DEPOSITS IN CALIFORNIA AMD OREGON
species show that, it belongs in tbe Paskenta group of the Shasta aeries, and it ia
ver? doubtful that it baa been found in any other beds.
LEDIDAK Adams
Leda Schumacher
Leda glabra Stanton
Uda glabra STAHTCW, V. 3. Ccol. Surv., Bull. 133, 1896, p. 63, pi. 0, fig. IS; near
Stephenson's, Cold fork of Cottonwood Creek, Tehama County,
The locality, field relations, and str&tigraphic position of the strata, from which
the holotype was obtained show clearly that it was found in the basal beds of the
Paskenta group, immediately above its basal conglomerate which forms Stephenson's
Peak, on the south aide of the creek. It was found accompanied by 14 other species
belonging ,n the lower port of the Paskenta group.
PAHXLt,BLI&ONTIDAE Ddl
Nemodon Conrad, 1869
Genotype 1Vemodon "eufalensis" Conrad
In the belief that Conrad's species {1869, p. 97r pi. 9. IS), the genotype of
Nemodtm, Is distinct from Area (Macrodon) eufaltntit Gabb, it was renamed Ncmod&n
cenradi by Johnson (1065, p. 9). It ia said to have come from the Upper Cretaceous
of New Jersey. The subject has been reviewed by Stewart (1930, p. 67) whose
amendment of Conrad's description aids greatly in the concept of Namodon, leaving
it clear that under thia generic name should be included many of tbe West Coast
species related to Ntmoian breiMriana (Gabb). Wbiteaves (1879, p. 163) attached
this generic name to two distinct species, under the impression, however, that they
were synonymous. In discussing Ifemadon wmeouwrenm Meek, he placed Nbrexoeriana
(Gabb) as a probable equivalent of the former, and this suggestion has
since been accepted by others.
The most important feature upon which tbe genus seems to have bean founded
ia in the character, form, and position of the binge teeth, as is well shown by Stewart,
although he has proposed a different designation far Gabb's species. From the
careful review of Nenu>dan given by Stewart, it does not appear that this genus can
he properly placed under Parallelodon Meek, although tbe genera are closely allied.
Nemo den breuxriarut (Gabb)
(PUto 3, flfuns ),