CALYPTOCRINID&. 357 
ion to the spines, the plates have strong ridges or angular protuberances 
passing out to the sides, where they meet with similar ridges from the 
plates below. The radials have six such ridges, one proceeding to the first 
costals, one to the basals, two communicate with those of the interbrachials, 
and the two remaining ones, which form a well defined pentagon at the 
lower margin of the cup, pass out to the adjacent radials. The smaller 
plates in the upper part of the dorsal cup are convex, and slightly angular 
in the middle. 
Horizon and Locality. — Lower limestone of the Niagara group, Lock- 
port, N. Y. 
Type in the collection of Dr. E. N. S. Ringueberg. 
Remarks. — Differing from all other American species in the depressed 
form of the dorsal cup, the surface markings of the plates, and in the num- 
ber, form, and direction of their spines. 
Callicrinus cornutus Hatt. 
Plate LXX XIII. Figs. 15, 16, 17. 
1867. Eucalyptocrinus cornutus — Haiti; 20th Rep. N. Y. State Cab. Nat. Hist., p. 322, Plate 11, Figs. 
8, 9; 10. 
1882. Eucalyptocrinus cornutus —R. P. Wuitrrerp ; Geol. Rep. Wisc., Vol. IV., p. 285, Plate 16, Figs. 
5-8. 
1885. (?) Lucalyptocrinus cornutus —W. and S.; Revision Paleocr., Part III., p. 133. 
Syn. Eucalyptocrinus cornutus, var. excavatus Hatt; 20th Rep. N. Y. State Cab. Nat. Hist., p. 322, 
Plate 11, Figs. 6, 7. 
Calyx, as seen from internal casts, more than twice as wide as high, dorsal 
cup broadly truncated, and enormously excavated at the bottom, the sides but 
very slightly expanding upwards, being almost vertical. The excavation at 
the bottom extends to nearly the full width of the cup, and to two thirds its 
height; the circumference is sharply pentangular with straight or slightly 
re-entering sides, the inner face grooved toward the angles, which are 
directed radially. The arrangement of the plates is rarely seen upon the 
internal casts, and not much better in the gutta percha impressions from 
the exterior. In the latter, however, it appears that the middle of each 
radial bears a long spine, which passes outward and slightly upward, and 
occupies the lower margin of the cup. From each side of these spines, 
strong ridges proceed to the upper lateral margins of the plates, which meet 
with similar ridges from the interbrachials. A somewhat larger ridge runs 
to the costals, where it divides and sends a branch to the distichals. From 
