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 ar- 

 ticulating surface, and assuming somewhat of a tumid utricular figure, 

 terminates in a superior floriform surface, on which are five triangu- 

 lar 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 strait encrinital body just placed be- 

 fore 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 ver- 

 tebral column with the pelvis. The utricular form assumed by the 

 body part of this encrinite has disposed me to name it the BOTTLE 

 ENCRINITE: the workers in chalk also distinguish these bodies by 

 the term chalk-bottles. 



Hence it appears, that two other species of encrini must have ex- 

 isted, 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 ex- 

 isted 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. 



