452 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
short, transverse node, and the lower portions of the first interbrachials are 
slightly thickened. ) 
Basals large, constituting a short cylindrical cup, fully twice as wide as 
the column, sometimes slightly expanding at the lower end, and hexagonal 
in outline. Radials much larger than the two costals together, wider than 
long, the lateral faces considerably longer than the sloping upper ones, the 
upper faces slightly concave. First costals quadrangular, one third wider 
than long ; the second pentangular, wider and longer than the first. Dis- 
tichals 2X 2 throughout the calyx, but those of the anterior ray are suc- 
ceeded directly by the arms; while in the posterior rays, in the division next 
to the anal side, and in both divisions of the antero-lateral rays, the second 
-_distichals are axillary, and support a palmar from each side. Arm openings 
directed slightly upwards; almost equidistant; the arm-bearing plates in 
contact laterally, except those facing the anal side, which are separated by 
a narrow, elongate plate. Arms sixteen, moderately long, rounded on the 
back, gradually tapering to the tips, and composed from their bases up of 
two series of rather long pieces. Pinnules long, the joints elongate. Inter- 
brachials two to three, those of the second row comparatively large. At the 
anal side also, the upper plates are large for this genus; the anal plate is 
higher than the radials, and succeeded by three plates, which are as high and 
almost as wide as the corresponding single plate at the other sides; the three 
plates of the second row are fully as large as the axillary distichals. Ventral 
disk conical, the plates large, nodose, and extended into a long central tube, 
which reaches far beyond the tips of the arms. The tube is stout at the 
base, but gradually tapers to a sharp point at the end, and is composed of 
similar plates as the disk. The posterior oral is pushed far out to the an- 
terior side; it is three times as large as the four others, more prominent, and 
arranged transversely. Column small, the nodal joints rather high, with 
rounded edges, and wider than the intervening ones. At 4 cm. from the 
calyx the last internode contains seven pieces. . 
Horizon and Locality.— Keokuk group; Indian creek, ten miles from 
Crawfordsville, Montgomery Co., Ind., where it was found by us in large 
numbers and in excellent preservation. 
Remarks. — Batocrinus agnatus 8. A. Miller, is identical with this species, 
with only two arms in the anterior ray in place of three. 
