LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

DESCRIPTION OF SPECIES 117
part of the Paskenta group. This spectea has been found also on Eagle Creek, near
Ono, in tbe lowest beds of the Horsetown group, which shows its range in the general
section of this region.
Phuladomya distorta Anderson, n. sp.
(Flit* 3. ficwu 1.10)
Shell small, subtriangular, somewhat inflated, subcordate in section near the
beaks; beaks anterior, high, incurved, approximate; shell truncated in front, margin
broadly rounded to tbe rounded basal border; posterior dorsal slope steep to the
narrowly'rounded posterior end; surface marked by concentric lines of growth only.
The distinguishing features of this shell are its exaggerated beaks, truncated anterior
margin, and its steep posterior slope.
The holotype (Calif. Acad. Sci., type Coll.) was found at Locality 1601 (Calif.
Acad- Sci.) by G, D, Sanaa near the Clements ranch on Redding Creek, eastern
Trinity County. It bas the following measurements; length, 35 mm.; height, 40
mm.; thickness of both valves, 27 mm.
The horizon of its occurrence is somewhat higher than that of the preceding
species, but it ia well within the limits of the Paskenta group. A single example,
probably of tbe same species, was found at old Horsetown, in the uppermost beds
of the Horsetown group, associated with Piuoiia hoffmanni (Gabb) and Bevdantieerat
bretoeri (Gabb).
Goniomya Agassiz
Goniomya veepera Anderson, n. sp.
(Plata J, i(va 4,5)
Shell small, elongate, slender, subqusdrate in transverse section, depressed;
umboneslow, nearly terminal; beaks small, strongly incurved, closely approximate,
and overhanging the end of tbe cardinal area; posterior dorsal margin straight,
rather long; posterior end apparently rounded; anterior portion short, sharply
rounded, open below; surface marked by a v-shaped sculpture, consisting of riroples,
or thin, raised ridges extending obliquely downward from the posterior cardinal
area, and finer, more oblique plications extending from tbe short anterior elope downward,
meeting the former set along a slight umboual ridge descending from tho
umbones obliquely downward and backward. The plications on the lower half of
the shell are nearly parallel with the basal margin of the shell.
The holotype (Calif. Acad. Sci. type Coll.) wae found by N. E. A, Hinds near
tbe Clements ranch on Redding Creek, eastern Trinity County. It has the following
measurements: length (incomplete), 19 mm.; height, 0 mm.; thickness of both valves,
10 mm. The holotype was found associated with Periplcmo irinttentit nov., Phy 11 octroi
dmenisi, and fieuromya pspyrocea Gabb.
As already stated, the horizon of this species is believed to be in the upper part
of tho Paskenta group. This species is the only representative of the genus yet found
in tbe Lower Cretaceous of California, although Whiteaves (1884, p. 225) records
one in the upper Xeocomian rocks of Frsacr River. A similar form, perhaps the
Bame, was found by Parker D. Trosk and the writer in Lower Cretaceous beds on
Rattlesnake Creek, a few miles east of Forest Glen, Trinity County.
AHATIMBAE Dall
Pcriplomya Conrad, 1S70
The application of this name by Conrad to American Cretaceous forms of Anatinidae
has been reviewed by Stewart. Conrad has suggested the name Lcptomya for a