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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 

 from 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 XIII. Fig. 73, where a vertebra, with an articular surface simi- 

 lar to those we have 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 vertebrae, the pelvis, and the ramifying 

 superior extremity. The only peculiar character by which it can be 

 distinguished from other species, appears to be the strait manner in 

 which the ossiculse are disposed, of which its pelvis is formed. From 

 this circumstance I am led to distinguish it by the appellation of 

 the STRAIT 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- 

 face is tuberculated or even rugose, and in others nearly smooth, 



