and has accepted Gabb’s later name for the genus. In the only speci- 
men of the present species yet found which preserves the beak the 
columellar plaits can not be detected, after cutting into the aperture 
as far as possible without risking the destruction of the specimen. 
The protoconch is also unknown. Therefore its assignment to this 
genus is tentative, though there is but little doubt about it. Among 
American species of Volutoderma, variously described as V olutzlithes, 
Rostellites, Scobinella, Fulguraria, and Volutoderma, in general out- 
line it agrees most nearly with V. wéllistona Logan from the Benton 
group of Kansas, but not in the shape of the whorls. The somewhat 
more angular periphery of the body whorl and greater proportionate 
length above the aperture distinguishes this shell from V. ambiqua 
Stanton, V. dalli Stanton, V. abbotti Gabb, and V. gabbi White. 
In the former particular it is easily distinguished from V. gracilis 
Stanton. From JV. dillert White it differs greatly in the character 
of the costae. From V. suciana Dall (= V. navarroensis of Whit- 
eaves) it differs in its more angular outline and more numerous 
revolving ribs. From V. b¢plicata Gabb it differs in the flattening 
of the body whorl above the nodes. V. protracta Dall, V. texana 
Conrad, V. nasutus Gabb, V. angulatus Whitfield, V. teaturatus 
Whitfield, V. d¢conatus Whitfield, and V. ovatus Whitfield are mostly 
much narrower in proportion to height, with longer apertures, and 
usually have decidedly shouldered whorls. —, 
The type and the large fragment hereinbefore mentioned, both 
now in the U. S. National Museum (Cat. No. 30878), and a smaller 
specimen in the University of Colorado cabinets, were broken from 
hard concretions in the sandstone member of the Fort Pierre Cre- 
taceous at Fossil Ridge, about 7 miles south of Fort Collins, Colo- 
rado, by. Mr. H. W. Clatworthy. 
CAPULUS SPANGLERI, new species. 
Plate XIII, figs. 5-7. 
Shell of moderate size, length from apex to extreme margin of 
aperture a little less than width; spire curves strongly backward and 
twists to the left; aperture transversely and irregularly elliptical; 
surface ornamented by ten or twelve very prominent ridges radiating 
from the apex downward to the aperture, more crowded in front than 
at either side and only one or two faint ones behind in the excava- 
tion ‘beneath the apex; otherwise the excavation is smooth except 
for the fine growth lines which are visible without a lens; height 
of the larger specimen measured vertically with the apertural margin 
in a horizontal position 17 mm., width of aperture 33 mm., length of 
aperture 28 mm., distance from apex to farthest margin of aperture 
