LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

114 LOWER CHETACEOTJS DEF08JTS IN CALIFORNIA AJTO OBEGON
Modiolus itantoni Anderson, n, sp.
Afadiala. major (Gabb) Sr.orroN, V. S. Geol. Surv , Bull. 133,1-895, p. 48, pi, 3. fig. 1;
one mils east of Stephenson's, Cold fork of Cottonwood Creek, Tehama
County.
Although St&nton believed that hie specimen represented Gabb's "Modiola"
major, a comparative study of various examples and the figures given by Gabb and
Stanton shows various specific differences. Stanton (IBM, pi. 3) notes that his
example ,J ie not quite so slender as Gabb's original figure," and this fact is readily
seen. In Stanton's example the shell is much larger, and the ratios of length to
height is li,S66; thickness not given,
A fairly well preserved example of thiB species found by Drew on the west border
of Berryesaa Valley in white limestone shows a ratio of length to height of 1: ,656,
and a ratio of length to thickness of 1: .460, It is 6 inches in length.
There are other differences; the beaks in Afodioltif major are more nearly terminal,
and the mnbonal ridge forms a smaller angle with the base than in Modiolus stanloni.
Both species occur in the white limestone on the west border of the Berryeaaa Valley,
associated with Aucefla piriformis, Inoceramua ovalus, and many other forraecommon
in the Paskenta group,
jlfodt'oltis (Votaifa) OfhMTMi* Anderson, n. sp.
(PUt* 3, Bruno i)
Shell small, aubcylmdrical, elongate, smooth; beaka nearly terminal, low,
rounded; hinge line nearly straight, one-half the length of the shell; posterodorsol
margin broadly curved to posterior end; anterior end narrowly rounded below the
beaks; ventral border nearly straight; lower part of the aide somewhat pinched near
the middle; surface smooth, or marked only by concentric lines of growth, inner
layer of teat pearly. The holotype (Calif. Acad, Sci. type Coll.) was found on the
North fork of Cottonwood Creak, half a mile above tha bridge at Ono. Length of
holotype, 47 mm.; greatest width, 17 mm.; thickness of both valves, 16 mm.
Its atratigraphic position is near the top of the Paskenta group 400 feet below
the base of the Horsetown, It was found associated with Plitsalula mn'oio Gabb,
Crioc.trat cf, Joium Gabb, and other pelecypods. A nearly related species, M.
(Volsella) henryi, was found by L. W. Henry in the Paskenta bedB in the northern
part of Berkeley,
Modiolus (Voktlki) henrvi Anderson, a. sp.
(Hat* 2, ftrure 9)
Shell small, subovate in outline, moderately compressed or narrowly lanceolate
when seen from above; cardinal and lower margins nearly straight, tha former
curving regularly into the rounded posterior border; beaks nearly terminal, closely
approximate, rounded below, anterior end curving sharply to tbe basal border.
The holotype and four other well-preserved examples were found by Leonard W,
Henry at the north border of Berkeley, near Arlington Avenue; they are in the
Museum of Paleontology, University of California. Tbey were found in strata not
far above tbe basal bed of the Paskenta group, The holotype has tho following
dimensions: length, 3ft mm.; height, 13 mm.; greMeflt convexity, 10 mm.; length of
largest example found, 2B mm.