LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

164 lower chetaceous deposits ijf california and oregon
A fragment of thia species was found by the writer at approximately the horiion
described by Stanton on McCarthy Creek; it is here associated with JVeoconriic*
jenkinsi nov., Thurmannia paakeniae nov., and AuceUa piriform** Lahusen. Its
berriasallid characters are clearly seen in its branching ribs and in its flattened
abdominal surface and its umbilical features.
Berriasclla ? ftyajli (Stanton)
ffoplitea hyalti STAUTOS*, U. S. Geol. Surv., Bull. 133,1S9S, p. 79, pi. 18, fig. 2 miles
southwest of Riddle, Oregon.
The hoplittd character of this species can hardly be questioned, but to what section
of "Hopliiee" it should be assigned is less easy to determine. According to
Stanton's account, the species is characterised by an
"abdomen slightly flattened, except on the last third of tha outer volution; surface
marked by numerous slightly curved ribs, the most of which bifurcate on the outer
third of toe volution and cross tbe abdomen, though not quite Bo prominent there
as on the sides."
As may be seen in the drawing by Stanton (1885, pi. 10, fig. 2), the periphery
on the last whorl appears narrow, if not angulate, recalling the early mature stages
of the following species, Lyticocera* paekardi, The association of the present
species with Aucella eras sic a J ft s indicates its age as Valanginian, probably somewhat
lower in the section than the preceding. Stanton (1905, p. 79) states that the
"species is related to H. itnaahi Felix and if. iipei Felix, from the Neocomian near
Tlaxioco, in the State of Oaxaca, Mexico, . . . also that its nearest relative among
Knoxville forme is Hoplilet tlorrsi." ...
As all these forms seem referable to Berrioiclla, the present form probably belongs
to this genus. It appears from Stanton's account that it was found in the upper part
of a thick sequence of conglomerate bordering the Cow Creek Valley on the west,
which is here regarded as representing the Paskenta group.
Lylicoccrat Hyatt
Lylicoceraa paekardi Anderson, n. sp.
(Plata II, ftgtms S, 1, fit
Shell of moderate size, flatly discoidal, narrowly umbilicato, sides of the cast
mostly smooth on the lower half, or showing only the costal lines, but strongly
coatate on the outer part; costae branching near the middle of tbe side, more clearly
visible on young adult shells; sutures hoplitid in character, but only partially exposed,
showing stout tripartite lateral lobca; periphery narrow, sub-angular, not
bordered by visible nodes; ventral zone gently rounded in young stages up to a diameter
of 40 mm., after which stage the periphery becomes more ridge-like, and, at a
diameter of 60 mm., the ribs on the two sides af the shell units chevron-like on its
median plane.
In its younger stages the shell possesses neocomitid characters in its small umbilicus,
flattened periphery, and numerous fiexuous costae, but in more mature stages
it develops the features of Lyticoeerai in its general form, dostation, and ridge-like
periphery, as in LyticaeeraB regale (Bean),
The holotype and other figured specimens are at the Oregon State College and
were collected by E, L. Packard at Locality 28S (Oregon State Coll.), a mile east of
Riddle, Oregon, They were found in a stratum of shaly sandstone associated with
Me&eomitea riddlentit, Dithotomitei orcgonciais, and Phyltoeerat tftmfense; this