and their articulating surfaces are formed by corresponding slight emi- 

 nences and depressions. 



What other differences exist between these pentacrinites can, how- 

 ever, be only determined by more successful observations and more il- 

 lustrative specimens than 1 can adduce, but which may be confidently 

 expected from such admirers of fossils as reside near the places where 

 these several species are found^ and are disposed to make the neces- 

 sary inquiries. 



The observations of Mr. Lister on the vertebral processes of the 

 pentacrinite, whose remains are found in the wolds of Yorkshire, are 

 so illustrative of the history of these animal remains, as to render it 

 probable that their admission in this place will be found advantage- 

 ous. This gentleman remarks, that 



" There may be observed, in the deep-jointed pieces, just under 

 the top joint above described, the vestigia of certain wyers rather than 

 branches ; and sometimes two, three, or more joints of the wyers yet 

 adhering. These wyers are ever five in number, viz. one in the mid- 

 dle or hollow part betwixt angle and angle. Again, in their jointed 

 pieces, there are ever five of these wyers, or a set of them inserted 

 into every conjugation of joints, so that it were some representation 

 of the thing, to imagine the stalk of Asperula or Equisetum. Also I 

 have seen, but that very rarely, (not in one piece among five hun- 

 dred,) a set of wyers in the middle of a deep jointed piece. One 

 pointed piece I have by me, where a wyer of twenty joints and up- 

 wards (and how much longer they may be I know not,) lies double 

 within the hollow side, and by that accident was preserved in its na- 

 tural place. It is no wonder," he observes, " that these wyers are 

 knocked off, and but very rarely found adhering to the stones they 

 belong to, being very small and slender, of a round figure, and smooth 

 jointed, being set together per harmonium, and not indebted suture. 

 Nothing that I can think of is so like these wyers as the auturnae of 



