87 
mits of the costal plates, are of a form similar to those of Poteriocrinites,and have 
also above a horse-shoe-like impression, with a transverse, perforated ridge, on 
which is inserted the first arm joint (fig. 10, and 11.) to which the cuneiform 
joint of the arm articulates, 
The Hanps.— Several horse-shoe-shaped joints (12. to 13. fig. 15. to 19.) 
closely resembling those of Pentacrinus Caput Meduse, articulate and arrange 
in two series on the cuneiform joint. Each series has at its summit a cuneiform 
Joint, from whose upper angular portion the two first series. of a double hand 
set off, interrupted again by a cuneiform joint, from which a finger and a second 
series of hand joints proceed, terminated by another cuneiform joint which 
supports two fiugers. Each hand, as far as I could ascertain, has six fingers, 
the whole number of them, therefore, amounts to sixty; they are all tentacu- 
lated at alternate sides, and resemble those of Pentacrinus Caput Medusa. 
An hexagonal or heptagonal plate generally interposes between the sca- 
pule where the truncated costal occurs, from which the integument, protected 
by calcareous plates, extends over the abdominal cavity and sulcy in the arms 
and hands. In a specimen in the Ashmolean collection at Oxford (fig. 29,30.) 
this integument is swollen out, and gives the specimen a singular appearance. 
The base of the column terminates in a fasciculum of muscular fibres. 
A specimen has occurred to me, where the columnar joints (fig. 22. to 24.) 
are alternately smaller and larger. Iam not aware whether it possesses suffi- 
cient character to be considered a variety of the former species. 
