New Spectes of Fossils and Remarks upon Others. 173 
interradials. The first rests upon the upper sloping sides of the basals, 
and is like the heptagonal first basals. It supports three plates, and 
these support four, which are followed by irregularly arranged plates, 
gradually diminishing in size to the top of the cup. 
_ Vault.—The vault is nearly flat, and slightly, if any, raised above 
the arm bases. Instead of a convex ridge from the center extending 
down the middle of the azygous area, as is usual in this genus, we have 
a flat vault, in the central part, and a concave depression near the 
margin indicating the anterior or azygous side. The whole vault is 
covered with numerous polygonal plates, without the presence of a 
proboscis. 
Arms.—There are twenty arms. 
Remarks.—The surface of the plates, which are preserved in part on 
a few specimens, appear to have been smooth. Those having a sub- 
pentagonal outline, when viewed from below, show an angle in the 
middle of the radial plates, but are without the elevated ridge, which 
characterizes these plates in S. christy?. The vault, in this species, is 
_wholly different from that in any other, but the general outline is, usu- 
ally, sufficient to distinguish it even when the form of all the plates is 
destroyed. 
SACCOCRINUS EGANI, 0. sp. 
Plate IV., fig. 4, view of the left side of a specimen With the plates preserved; fig 4a, view 
of the vault with the plates removed. 
Body somewhat obconic; length about 1 3-10 inches; greatest 
diameter at the arms about 95-100 inch. 
Basals hexagonal, wider than high, and strongly convex in the lower 
central part, so as to give these plates, as seen from below, a sub-tri- 
angular outline. 
First radials have length and width about equal ; three are hex- 
agonal, and two heptagonal. Second radials hexagonal, longer than 
wide, and smallerthan the first. Third radials smaller than the second, 
heptagonal, and about as wide as high. First secondary radials hex- 
agonal, and about half as large asthe third radials. Second secondary 
radials much smaller, hexagonal or heptagonal, and support upon the 
upper sloping sides the tertiary radials. Tertiary radials very small, 
and support the brachial series. 
Regular interradials nine, the lower one of which is hexagonal and 
about the size of the second radials. This is followed by four pairs of 
plates gradually diminishing in size to the top of the tertiary radials. 
