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 Hall. 

 Plate LXXXIII. Figs. 15, 16, 17. 



1S67. Eiiculi/ptocrinm cornutus — Wku.; 20tli Rep. N. Y. State Cab. Nat. Hist., p. 322, Plate 11, Figs. 



8, 9, 10. 

 1882. Eucali/plocrimts cornutus — R. P. Whitfield ; Geo). Rep. Wise., Vol. IV., p. 285, Plate 16, Figs. 



5-S. 

 1885. (?) Eucali/plocrinus cornutus — W. and S. ; Revision Paloeocr., Part III., p. 133. 



Syn. Euralyptocrinus cornutus, var. excavatus Hall ; 20tb Rep. N. Y. State Cab. Nat. Hist., p. 322, 



Plate 11, Figs. 6, 7- 



Calyx, as seen from internal ca.sts, more than twice as wide as high, dorsal 

 cup broadly truncated, and enormou.sly 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 wnth 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 



