LOWER LIELDERBERG ROCKS. 
119 
The arm terminates below in a rounded condyle, without any appearance of an 
articulating surface or point of attachment to any other body; as if the arm, as it 
now occurs, had had an independent existence; or at least had the power of se¬ 
creting calcareous matter to cover the broken and rough extremity, if broken from 
a body of the usual character of crinoids. This condyle-like extremity of the arms 
is figured on Plate v, and in a separate fragment represented on Plate vi, fig. 2 & 3. 
PLATE V. 
Fig. 5. A specimen with the tentacles more closely arranged than usual, and terminating 
below in a round condyle-like extremity. 
Fig. 6. A specimen preserving eight of the tentacles upon one side of the arm, and four 
upon the other. 
Fig. 7. An arm coiled, showing the points of attachment, with numerous detached fragments 
of tentacula. 
PLATE VI. 
Fig. 1. The inner side of an arm with tentacles attached, showing on the right side one at 
unequal distance from the others. 
Fig. 2 & 2 a. Inner side of the base of an arm ineluding the first three joints, with points 
of attachment for the tentacles t, t ; and the same enlarged. 
Fig. 3. Exterior surface of the same enlarged. 
Fig. 3 a. Transverse section, showing the form of the arm-joints. 
Geological position and locality. In the lower part of the slialy limestone of the 
Lower Helderberg group : Helderberg mountains and Schoharie. 
Genus Edriocrinus (n. g.). 
[ Gr. £(5piaw, scclco; xptvoj, lilium .] 
Body subconical. Base solid, without division into plates : upper margin 
marked by six angles, with depressions between for insertion of radial 
plates. Radial plates five, inserted in the five larger depressions on the 
upper edge of the calyx. Anal plates two, the lower one inserted in the 
smaller of the six impressions on the upper margin of the calyx; the 
second anal plate placed on the upper edge of the first. Brachial plates 
numerous, consisting of thin plates in consecutive series resting upon 
the upper concave edges of the radial plates : pinnules subdivided 
above. Tentacula unknown, 
Proboscis unknown. 
Column none. 
