210 PALAEONTOLOGY OP NEW-YORK. 
Fig. 3 h. Lateral view of the preceding specimen, which is broken off near”the base of the 
arms. 
Fig. 3 c. View from below, showing a portion of the cavity; the sides arching over, and con¬ 
tracting to the angular canal which extends to the summit. The interior of this 
cavity is formed by the expansion of the solid ribs between the fingers, which 
unite, lining the entire upper part of the cavity ; beyond which, their inner edges, 
uniting just before reaching the centre, produce the angular canal which reaches 
from the cavity to the summit. By this union of the interior edges of these ribs, it 
will be perceived that the tentacula are confined within solid walls, and become (as 
before remarked) anchylosed, forming, with the ribs, essentially a solid mass pene¬ 
trated only by the narrow canal. 
It should be observed that this specimen is somewhat compressed, and in conse¬ 
quence the form of the canal is distorted. 
Fig. 3 d. Another specimen, showing a longitudinal section of the upper part, and a portion of 
the cavity below. The centre is marked by the angular canal formed by the junction 
of the ribs, as just described. On the outer margins are the joints of the fingers, 
with the tentacula attached, all converging inward and upward to the walls of the 
central canal. 
This specimen, with the preceding, when taken in connexion with the other figures 
where the base is preserved, give a very clear idea of the structure of this peculiar 
crinoid. 
Position and locality. In the shale of the Niagara group at Lockport, Rochester and Mar¬ 
shall’s mill in Sweden, Monroe county, New-York ; and in several localities in Kentucky and 
Tennessee. ( State Collection.) 
597. 2. EUCALYPTOCRINUS CjELATUS. 
Pl. XLVII. Fig. 4o-fi. 
Hypanthocrinites ccdatus. Hall, Geol. Rep. 4th Dist. N. York, 1843, pag.113, fig. 1. 
This species was separated from the preceding, on account of the sculptured surface of the 
hand and finger-joints, as well as the surface of the interstitial ribs. The plates below are also 
much more strongly tuberculated than any other specimen observed. This character is the 
principal external one, by which it differs from the specimens before described. In measuring 
the extension of the finger-joints towards the centre, they are found to be proportionally much 
longer than in either of the specimens fig. 2 d and 3 d, which furnishes an additional character 
on which to found a separation. For these reasons, I have allowed the species to remain as 
published, until an opportunity offers for a comparison with other specimens. 
Fig. 4 a. The specimen, somewhat broken in the upper part. 
Fig. 4 b. The surface of one of the interstitial ribs, enlarged. 
Fig. 4 c. Several joints of the fingers enlarged and separated, showing their deep interlocking 
with each other near the base, and the character of their surface marking. 
