72 TRANS. OF THE ACAD. OF SCIENCE. 
ited by Prof. Swallow in his Report of the Geol. Surv. of Mis 
souri. 
Dicuoerinus cornicervus. ( Shum.) 
Fr.” FQ. 1, G, 0, °t, a, 
For this interesting species of Dichocrinus I am indebted to 
my friend, Mr. Henry Pratten, of the Illinois. Geol. Survey, who 
informs me, that it was ébinined from the ag ee ne 
at Buzzard Roost, Franklin County, Alabama. Ins espects, - 
it is the most perfect specimen of the genus faerie. dcschall 
as it shows very satisfactorily, not only the lower yea ig the body, 
but also the vault entire and the first joints of the a 
Description.—The general form of the body is sb obliquely 
flattened < on es anal pes and the pieces of which it is composed — 
are thicker t in t of its congeners. The calyz has the 
form of an cnciad, Soir cone; its plates mosermes con- 
vex, and their surfaces smooth, The base consists of two pentag- 
onal pieces, precisely alike, and these unite in the nade line of 
e body by a straight suture to form a shallow cup, which is 
transversely elongated, and occupies about one-third the height of 
e calyx. The under surface presents a large, shallow, but well — 
defined depression of an elliptical shape, in the centre of whic 
isa wry small circular mee for articulating with the last joint of — 
the column. superior border is octagonal, with six angles — 
salient, and two eiveating: the latter being situated on the sides 
which correspond to the long diameter of the base; one of them 
receiving the inferior angle of the large anal piece, and the othe 
that of the opposite radial. 
The radial pieces, five in number, are large, about as wil as 
high, and expand slightly in width from below upwards; four 
are nearly of the same form, and rest by st raight edges on the 
base; the fifth is larger than the others, and nate below 12 
” obtuse pale: the apex of which corresponds to one extremit} 
e basal suture. The superior edge of each piece is excava- 
=i about fwro-thirds its width, and here presents a double articulat 
facet, on which repose two brachial pieces. All the radials — 
very. ie ae from below upwa a ant unite with the 
ae is Pate marked sutures. : 
are small, heer or heptagonal, and 
a gt ieedtee heir number varies from four to five, and they, 
rest by their aa angles on the oblique, superior, lateral edges 
ae 
The brachial are itre very shorts and 
small. Each radial plate cal 3 he that there are 
ten brachials in a single series, and, being axillary pieces, they 
Support twenty very slender, simple arms, of which only one oF 
two of the first joints are preserved in. the ser figured. 
pon are very small, Bp ye eyo em ees articular faces are 
