LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

description of species 231
Belemnopsit (Hibolittt) dimntrmdei Anderson, n- sp.
(Plau SB, 6|um 3, 3», lb)
Only fragmentary examples of this specks have yet been found. Two such fragments
found near together seem to have been parts of a single individual and have
been figured as auch. Both show the characteristic diventroid section and rounded
dorsal side of the guard. Nevertheless, the larger of these fragments is taken as
the holotype, to which the other may be regarded as supplementary. In the holotype
(Calif. Acad. Sci. type Coll.), the dorsal side iB semicircular in section, whereas the
ventral aide is traversed by two parallel grooves, between which there is a low,
rounded ventral ridge, of which the curvature has a shorter radius. The guard is
slightly fusiform, tapering from near the middle toward both ends, but more rapidly
toward the apex. The holotype has the following dimensions: length (incomplete),
64 mm.; maximum diameter, 9.S mm. It was found in the lower part of the Horsetown
group on Fiddler Creek, half a mile north of the big bend of the crcek at which
the Mitchell zone is exposed, and not less than 600 feet beneath it. The nearest
know a analogue appears to he "Betemnitea" bicanalteuiala de Blainvi lie, as figured by
d'Orbigny (1842, pi. 3, figs. 13-16), which Stolley places in the genus Hiboliles de
Montfort. According to d'Orbigny (1850, p. 62), this spcciea ia of Neocomian or
lower Xeocornian ago.
jVeohibolitet Stolley 1911
Ncchiboliles fontinalif Anderson, n. sp.
(Piste SI, 6gun» J, 8)
Bdemnitet&p. ANDERSON, Calif. Acad. Set., Pr, 3d ser., vol. 2, 1902, p. 146, pi. 8, figs.
109, 170; Texas Springs, Shasta County.
The guard of this species is long and slender, slightly fusiform in ita lower twothirds,
expanded in its alveolar portion; section of guard nearly circular, axia central;
phragmacone only slightly inserted, with an apical angle of about 26 degrees;
ventral groove rather faint, not showing on the bolotypa; apex acuminate. The
holotype (Calif. Acad. Sci. typo Coll.) measures: length, 68 mm.; greatest diameter,
7 mm.; diameter below alveolus, 6 mm. Thia example, with varioua others leas complete,
was found at Texas Springs, 3 miles east of Horsetown, associated with Sonneralia
stantoni, Beudantreeras haydeni, and TetebraUlla dtnsleonia Anderson. The
species has some resemblance to Ifeohibolites vliimve (d'Orbigny) from the Cenomanian
of England, but its relation is perhaps only generic. It is longer, more slcndar,
and has a more acuminate point. Ita horizon, as shown by its assoc iates, ia near that
at Horsetown which is believed to be near the upper limit of the group. It has been
thought by earlier writers to represent the lowest beds of the Cbico series; in cither
case the horizon is in the upper part of the Albian.
BELKWNQTEUTIIIDAE Zittel
Belcmnnteuthis Pierce (Conoleulhis d'Orbigny)
Behmnoteulhis (CWoteuiAw) pacifiea Anderson, n. sp.
(Flats 77, figures 2,3}
Phragmacone large, circular in section, apparently straight, tapering slowly;
septa tlun, numerous, "nested"; holotype (Calif. Acad. Sci. type Coll.) is an incomplete
example, showing only eight septa; diameter of largest septum, 76 mm.; diameter
of smallest septum, 65 mm.; deeply and uniformly concave; average interval at
center, 5 mm.; total length of holotype (est.), 300 mm.; phragmacone without guard