231 
Whether these differences on the surfaces of these bodies are the dif- 
ferences of varieties only, I am unable to determine, from any of the 
specimens which I possess. Nor am I able to point out, with any degree 
of certainty, any of the other parts of the animal to which these 
vertebrae have belonged. I have, however, very little doubt, that they 
served to constitute the vertebral column of the animal, the body part of 
which is represented Plate XIII. Fig. 75 and 76. 
This body of an encrinite, Fig. 75, gradually enlarges from its arti- 
culating surface, and assuming somewhat of a tumid utricular figure, 
terminates in a superior floriform surface, on which are five triangular 
depressions. By the assistance of a glass, this body part may be 
seen to be divided into ribs, clavicles, and scapulae, very much in the 
same manner as is done in the straight encrinital body just placed before 
you, Plate XIII. Fig. 34. At Fig. 76 is represented another of these 
fossils, in which the first vertebra is still adherent to the body part, 
a very fine, somewhat raised line, marking the union of the vertebral 
column with the pelvis. The utricular form assumed by the body 
part of this encrinite has disposed me to name it the Bottle En- 
CRINITE : the workers in chalk also distinguish these bodies by the 
term chalk-bottles. 
Hence it appears, that two other species of encrini must have existed, 
the articulating surfaces of whose vertebrae bore a very close, if not 
an exact, resemblance with the ossiculae of the extremities of the tortoise 
encrinite. 
The next objects of research were the fossils corresponding with 
those just described, in their tuberculated, granulated, or rugose 
surface. This inquiry terminated in only ascertaining that there existed 
a species of encrinus, whose vertebrae, represented Plate XIII. Fig. 69, 
bore on their sides these peculiar markings : these trochitae differing, 
however, essentially, from the vertebrae of the preceding species, by 
radiated or trochital surfaces of articulation, and by being pierced with 
a much larger foramen. 
