342 PALEOZOIC PALEONTOLOGY. 
ECHINODERMATA. 
CRINOIDEA. 
EDRIOCRINUS SACCULUS Hall. 
Plate XLV., Figs. 3-5. 
1859. Hdriocrinus sacculus Hall, Pal. N. Y., vol. IIT., p. 148, pl. 87,. 
figs. 1-22. 
Description.—Body free, not having a columnar attachment. Base 
solid, no sutures recognizable, varying from turbinate to subglobular 
in form, its upper margin indented by six more or less distinct, shal- 
low, rounded sinuses, which are occupied by the five radial plates and 
the anal. Radial plates subquadrangular in outline, usually a little 
wider than long; the proximal margin convex, in contact laterally, 
except on the posterior side; distally the articulating facets for the 
arms occupy the entire width of the plates. Anal plate resting upon 
the base and separating the two posterior radials, quadrangular in out- 
line, higher than wide. Arms free above the radials, broad and flat 
at the base, consisting of very broad and short brachial plates, which 
bifurcate somewhere from the ninth to the fifteenth plate, and later bi- 
furcate several more times. 
The dimensions of a large calyx, not preserving the arms, are: 
height, 49 mm.; maximum diameter, 38 mm. 
Remarks.—In New Jersey only the imperfect bases of this species 
have been observed, and even such specimens are not common. No 
specimen preserving the radial plates or the arms has been observed, 
and the description given above has been drawn up from Cumberland, 
Maryland, specimens. 
