^02 
ribs) are placed the clavicles, each of which is composed of five 
pieces : a central orbicular piece placed on the centre of the superior 
edge of the rib, with an oblong piece, attached to it on each side, and 
two triangular pieces filling up the cavities left between the tops of the 
last-mentioned pieces, of the orbicular pieces, and of the scapulae. 
It was endeavoured to be shewn, whilst treating of the lily encrinite, 
that a greater extent of motion was given by the alternation of wider 
and narrower vertebrte, and by the edges of the former overlapping 
those of the latter ; and it was seen that this arrangement constantly 
took place, in that part of the column which was nearest to the 
body of the animal. A similar conformation and arrangement of 
the Vertebrae exist in by far the greater part of the fragments of the 
vertebral column which are found in this mass, and therefore may be 
concluded to be the fragments of that part of the column, which was 
nearest to the skeleton of the body of the animal. 
I was much pleased by obtaining, at the sale of Mr. Strangers mu- 
seum, a calcareous mass from Wenlock, which is rendered exceedingly 
interesting, by its containing that which I conceived myself to be fully 
warranted in considering as the inferior termination of this species of 
encrinite. Like the former, this mass is chiefly made up of the frag- 
ments of the vertebral column, intermixed with pieces of a small 
ramose millepore, and a few other marine remains ; but, unlike those 
of the former mass, the fragments of the columns, with the exception 
of two or three only, are composed of vertebr2e of a similar thick- 
ness, from which it may be concluded that they did not belong to 
that end to which the skeleton of the body part of the animal was 
attached. The vertebrae are here all exceedingly thin, with a cir- 
cular central foramen, and a very finely crenated surface. In some 
of the vertebrae, which form the column most distinguishable for its 
size, an obvious peculiarity of character is observable ; some in one 
part and some in another lose their circular form, by lateral protru- 
sions, in which a central foramen is observable. By these pro- 
jections from the sides of the vertebrae, the column acquires a rough 
