ECHINODERMATA OF THE BRASSFIELD FORMATION 
15 
crinidae, however, have an anal plate following a truncated 
basal. In the present state of our knowledge of these calyces 
any attempt to assign them to some definite family of crinoids 
would be merely guesswork. The chief reason for calling atten- 
tion to them is the fact that this and the preceding species 
possibly may belong to the interesting coiled crinoid stems de- 
scribed earlier in this paper. They are of sufficient size, have 
a large enough lumen, the surface markings on the area of attach- 
ment are similar, the specimens occur at the same horizon, and 
in sufficient numbers at least to suggest a possible former 
connection. 
Figure 41 on plate VIII of vol. 3, Bull. Sci. Lab. Denison Uni- 
versity, probably represents another specimen of the same species 
as that here described. This figure is reprinted on plate 27 
of vol. 7 of the Ohio Geological Survey, published in 1895. The 
specimen was obtained at Reed’s hill, east of Fairfield, Ohio. 
Clidochirus sp. 
Plate VII j fig, 1 
Species named by Springer in his Monograph of the Crinoidea Flexibilia, now in 
press. 
Infrabasals low, not exceeding 1 mm. in height, presumably 
three although the complete circuit is not preserved in the speci- 
men at hand; exposed surface erect, taking part in the calyx 
wall and having about the same slope as that of the basals. The 
right posterior infrabasal is broadly triangulate above. The 
anterior and right anterior infrabasals are merged into a single 
plate with a gently concave upper surface, bearing the right 
anterior basal. Although the left anterior and left posterior 
basals are only imperfectly preserved, it is assumed that these 
plates also are merged into a single plate with a gently concave 
upper margin, bearing the left posterior basal. The height of 
the basals only slightly exceeds their width, excepting in the 
case of the posterior basal which is a little higher and bears the 
anal x plate on its upper right margin. This anal x plate is in 
contact with the upper left margin of the radial at the base of 
