LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

193 LOWER CRETACEOtffi DEPOSITS IN CALIFORNIA AND OREGON
Puzoria subquadrata (Anderson)
(Pl»i» arm* 4, »)
Desmoceraa aubquadrata ANMSB30W, Calif. Acad. Sci., Pr., 3d ser., vol, 2,1902, p. 96,
pi. 4, figs. LIB, 116; pi. 10, fig. 193; Cottonwood Creek, Shasta County, upper
part of Horsetown group.
Tbia species is closely related to P. diUeri but differs in form and ornamentation,
bavin; no transverse grooves or only faint traces of them. The ribs are more nearly
uniform in size and somewhat coarser than the minor riba of the preceding spccics.
Tho holotype is in tho Museum of Paleontology, University of California. The
plesiotype (Calif. Acad. Sci. type Coll.) has the following dimensions: greatest
diameter, 102 sun.; width of umbilicus, 34 mm.; height of whorl, 43.3 mm.; width
of whorl, 40 mm.; umbilical ratio, 0.333:1. Thia example was obtained at Locality
1659 (Calif. Acad. Sci.) on the east branch of Hulen Creek, in the Neptune zona,
associated with Douvilleiceraa mammillalum var,, Beudaniiccra* btcumri (Gabb),
Lytoctraa neptunium nov., and many other species. Its horizon is regarded as uppermiddle
Albian, This specica is among the number indicated by Kilian and H.ehoul
(1000, p. 25) aa being referable to Koaamaiiceraa Groseouvre, but it is not apparent
that that genus, or that any of the subgenera Bought to be established by these
authors, has representatives in the Lower Cretaceous of California. No apeoiea
mentioned by them can properly be regarded as within the legitimate limits of either
form or horizon assigned to Kosamaticera*, as defined by GroBsouvre or by themselves,
The genus, aa indicated by its author, should be restricted to-Upper Cretaceous
strata.
Puioria aldertona Anderson, n. sp.
(Plata 39, ipn 3)
Shell robiiBt, large, slightly comprcaaed; umbilicus of moderate width, bordered
by steep walls, rounded above; section of whorl broadly elliptical, higher than broad;
surface marked by Ave nearly straight, or slightly curved, ahollow transverse grooves,
bordered by ridges which, on the shell, form only a slight sinus in the ventral area;
interspaces between grooves occupied by about 20 to 22 rounded costae; suture lines
crowded, but similar to those of P. hoffmanni (Gabb). This specieB is closely related
to P. di'Hert (Anderson) but it ia more robust, has a smaller umbilical ratio,
and increases more rapidly b size, having a higher whorl section. Its bcriron ia
above that of P. ditteri and below that from which the type of P. hoffmanni came.
The holotype (Calif. Acad. Sci. type Coll.), septate throughout, has the following
dimensions: greatest diameter, 190 mm.; width of umbilicus, 53 mm.; height of
whorl, 77 mm.; width of whorl, 35 mm.; umbilical ratio, 0.206:1.
Tbe holotype was found on Alderaon Creek, 2 miles south of Ono, in the upper part
of the Horsetown group (upper-middle Albian), a little below the horizon of Oxylropidectraa
paebardi nov.; it has not been found in any other horizon. Two fairly good
examples were found at the type locality. This is one of the largest species of
Puzosto yet found in the Cretaceous of California. It has some resemblance to P.
matheroni (d'Orbigny), from the lower Aptian of France, but its critical measurements
are different, and its stratigraphies! position ia much higher.
Pujrotia kojfmattni (Gabb)
(Plata