10 The American Geologist. Juiy,i894 
whorl obliquely flattened below and above; aperture subcir- 
cular, apparently as high as wide; no umbilicus; columella 
flattened below; whorls marked with prominent, oblique 
growth-lines, and ornamented with three strong, equidistant, 
coarsely but regularly beaded carinas above which, on the 
body-whorl, is a fourth smaller one close to the suture. 
Measurements). — Might 15; breadth 14.5 mm.; divergence of 
slopes 85 degrees. 
Occurrence. — Two specimens only of iliis species are known. These 
were obtained: one in No. oof the Belvidere section, three fourths of 
a mile south of the railway station; the other from No. 3, aboul ;i mile 
and a half soul h west of the station. 
The species is very closely related to M. mudgeana Mk., from which 
it is distinguished chiefly by the beaded character of the revolving 
carinae, a character which also distinguishes it from Turbo reedi 
Kpng. <>ur specimens are somewhat smaller than the type of .1/ 
mudgeana, as figured i>\ Meek. 
'Phe species is named iii honor of Mr. .biles .Marcoii. discoverer of 
the American Neocomian. 
MARGARITA (SOLARIELLA) NEWBERRYI. sp. nov. 
Shell thin, low- turbinate, or spherico-turbinate, consisting- 
of about four rapidly enlarging whorls, spire small and low. 
the sutures rather deeply impressed, the body-whorl very large 
and ventricose ; surface of each whorl ornamented with coarse, 
unevenly elevated revolving lines or granuliferous ridges, the 
intervals between which are marked with usually two similar 
but much finer revolving lines, the whorls being also obliquely 
crossed by a system of rather remote, narrow, raised lines 
which proceed from the apex down the slopes of the shell 
with a somewhat sigmoid, or sickle-like, curvature and pro- 
duce more or less distinct eminences at their intersections 
with the revolving ridges. Of the primary revolving lines or 
ridges, there are six or seven on the flank and shoulder of the 
body- whorl. 
Measurements. — Hight of shell 13.5; breadth of body- 
whorl 15 mm.; divergence of slopes 104 degrees. 
Occurrence. — The type ami only known specimen of this species was 
found in No. 5 of my Belvidere section, half or three-fourths of a mile 
south of the railway station, associated with Gryphcea pitcheri, var. 
JiUli. Cardita belviderensis, etc. 
The base of the type specimen is imperfect, and does nol show the 
