261 
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 I 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 
jointed 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 harmoniam, and not indebted suture. 
Nothing that I can think of is so like these wyers as the auturnse of 
