Description of New Genera of Echinodermata. 5 
by the second azygous plate; the ridge has a furrow upon the outer 
side in the central part of each plate, and within this there is a wide 
expansion which supports the brachial and arm pieces. ‘The first 
azygous plate has four sides, rests between the upper sloping sides 
of two subradials, and the long under side of the first radial on 
the right, with the shorter side abutting upon the second azygous 
plate. The second azygous plate is hexagonal, curves inward and 
supports upon its two short inner faces the third and fourth azygous 
plates side by side. The vault and other parts unknown. 
This species would seem to have its nearest affinity with E. 
tuberculatus, which is described in the Geo. Sur. Ill., Vol. II., 
p- 319; in that species, however, the plates are covered with regu- 
larly disposed, narrow, prominent tubercles, the tubercles being 
arranged in rows, while in this species there is no such arrange- 
ment. EE. tuberculatus is figured in Geo. Sur. Ill., Vol. V., Plate 
XXIV., Figs. ga and gb, and the basal plates are proportionally 
larger, and the under sides of the subradials longer, than they are 
in the species under consideration, beside all the plates have a 
different shape, and the sutures are not excavated so deep as in the 
species before us. 
Found in the Upper Coal Measures of Kansas City, Missouri, 
and now in the collection of Wm. F. E. Gurley. 
EUPACHYCRINUS SPHARALIS. N. Sp. 
Flate I., Fig. 3, basal view; Fig. 4, azygous side view. 
This species is large and constricted at the top of the first 
radials; calyx somewhat like a widened or inflated sphere, width 
two-thirds greater than height, sutures distinct but not so deeply 
excavated asin E. magister; plates irregularly tuberculated, but 
tubercles not half as large as in E. magister. 
Basal plates are sunk in a cavity on the under side, and project 
less than half their width beyond the column ; subradials large, 
extend into the basal cavity and curve upward half the height of 
the calyx; three are hexagonal and two heptagonal; first radials 
pentagonal, though the one on the right of the azygous plates hasa 
very short truncated side abutting upon the azygous plate: second 
primary radial, or first brachial piece, smaller than the first and of 
similar form, except inverted, and bears upon its upper sloping 
