114 
GEOLOGY OF THE FOURTH DISTRICT. 
does not rest on the scapular. It is plainly referable to this genus of Mr. Phillips, and to 
the genus Eucalyptocrinites of Goldfuss, as it is impossible that the figure which he repre¬ 
sents, pi. 64, f. 7, should have had no column. The plates which Mr. Phillips describes as 
costals are in fact the pelvic plates, as can be plainly seen in the specimen here described, 
the upper portion of the column still remaining enclosed. 
Locality —Lockport, Sweden, Monroe county. 
2 and 3. Hypanthocrinites decorus . {Silurian Researches, p.672, pi. 17, f. 3.) — The 
description of the last corresponds with this except in the few particulars noticed. This is 
apparently the fossil described by Mr. Phillips. The ribs, however, instead of being rounded 
and elevated toward their upper extremities, as there represented, are grooved (as in fig. 2,) 
with a few slight tubercles, as if fitted for the attachment of some muscle or integument. 
(This may possibly arise from an exfoliation of a part of the rib.) The tubercular plates 
surrounding the mouth are not seen in the specimens figured, though they are in others. Fig. 
2 represents the upper portion, which is broken off just above the plates, presenting a view 
of the internal cavity beneath. 
Locality —Lockport. 
4. Marsupiocrinitesl* dactylus, Hall. — Pelvic plates five, pentagonal,! slightly recurved 
a.t the base ; first costals five, pentagonal, supporting five hexagonal second costals ; inter¬ 
costal plates five, equal, and regularly hexagonal, resting on the superior lateral edges of the 
first costals. Scapulars five, pentagonal, resting on the superior edges of the second costals, 
and supporting upon their superior lateral edges two obliquely cuneiform hand joints ; inter¬ 
costal?) ten, somewhat unequally six-sided, resting on the superior lateral edges of the se¬ 
cond costal and intercostal plates. Upon the inner superior lateral edge of the interscapular 
plate rests one edge of the hand joint, and upon the superior edge rests the base of the second 
hand joint, which supports a finger composed of a double series of plates, uniting by their 
lateral cuneiform edges, producing a longitudinal suture in the finger. The fingers are ar¬ 
ranged somewhat in pairs, and separated by a cuneiform plate which rests upon the edges of 
the hand joint. Between each pair of arms are two plates, one pentagonal, and the other 
minute, quadrangular, both resting on the superior lateral edges of the interscapular plates. 
The upper figure represents very clearly the structure of this crinoid ; the plates are 
slightly ornamented on the surface, and joined at the edges by a suture. The column is 
composed of a double series of plates, one extending beyond the other, and are ornamented 
on their edges. 
Locality —Lockport. 
* This fossil is provisionally referred to this geuus of Mr. Phillips, though it will probably require to be separated, 
t They are represented in the wood cut as triangular, but the lateral edges join, forming a short side. 
