235 
a magnifying glass, their form and structure is seen to agree very exactly 
with the ramified arms of the preceding fossil. 
The small calcareous fossil body, from the same place, delineated 
Plate XIII. Fig. 82, is here introduced, in consequence of the am- 
biguity of its appearance. From the resemblance which its general 
surface bears to that of the last fossil, it might be concluded to be 
the detached arm or tentaculum of that animal in an extended state ; 
a smooth circular pit at its inferior extremity renders this opinion not 
improbable. A magnified representation of one of these bodies is given, 
Plate XIII. Fig. 83. 
The nature of the calcareous fossil, represented Plate XIII. Fig. 
36 and 37, is very ambiguous. I was favoured with it by Dr. Wood- 
house, of Philadelphia, who, avowing his inability to ascertain any 
thing respecting its original mode of existence, informs me that it 
was obtained from Kentucky, where similar bodies are frequently 
found of a larger size, and that they are there considered as a species 
of petrified nuts. 
This fossil is somewhat of a conical roundish form, the centre of its 
base terminating in a small round projection pierced in its middle, 
with a little opening into the centre of the fossil : from this projec- 
tion the base extends nearly horizontally to five prominent points, be- 
tween each of which exists a shallow depression. At the apex of the 
cone five small openings are placed at the angles, formed by the 
meeting of the lines, which bound five long triangular surfaces, which, 
commencing at the summit of the fossil, are disposed tapering, down 
the sides, and terminate in the projecting points which are placed round 
the base. Along the middle of each of these surfaces, a grooved line 
passes, from which upwards of forty minute processes on each side pass 
to the lines which bound these surfaces at their sides. 
The opinion which I formed on the first view of this fossil was, that 
it belonged to some animal approximating to the encrinus. The cen- 
tral projection at its base has, however, suffered so much by friction 
