230 
these surfaces, by which they articulated together, similar to the arti- 
cular surface of the former bodies. Pursuing the examination of these 
bodies, through the different sizes which I possess, I found others of a 
smaller size, as at Fig. 71, and at last arrived at a soliary specimen, 
Fig. 72, which is evidently one of the terminations of this series. Thus 
we discover the superior termination of an encrinite, entirely different 
fiom any which we have yet seen, and which appears to be rather re- 
ferable to some species which has been hitherto totally unnoticed, than 
to the tortoise encrinites, to which, from the peculiar mode of its ar- 
ticulation, there seemed at first to be reason for supposing that it be- 
longed. 
That It does not belong to that animal is, indeed, rendered almost 
certain, by the fortunate discovery of the small illustrative specimen, 
Plate XIIL Fig. 73, where a vertebra, with an articular surface simi- 
lar to those we havx been describing, is seen to proceed from a flat, 
expanded, and ramifying base, which, on its inferior part, has every 
appearance of having adhered to some other body, and which, there- 
fore, may properly be considered as the pedicle of this animal. Of 
this small species of encrinite we therefore seem to possess the organ of 
attachment just described, the vertebra, the pelvis, and the ramifying 
superior extremity. The only peculiar character by which it can be 
distinguished from other species, appears to be the straight manner in 
which the ossiculae are disposed, of which its pelvis is formed. From 
this circumstance I am led to distinguish it by the appellation of the 
STRAIGHT Encrinite. 
Pursuing the examination of such bodies as are characterised by 
this particular species of articulation, I was led to the examination of 
the spathose vertebra, Plate XIII. Fig. 74. This fossil, which was 
also imbedded in chalk, is barrel -formed, having a similar articular 
surface at each end with the fossil just treated of, the surface of its 
sides being finely granulated : but in some of these bodies, this sur- 
aee is tuberculated or even rugose, and in others nearly smooth. 
