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 scapula?. 



It was endeavoured to be shewn, whilst treating of the lily encri- 

 nite, that a greater extent of motion was given by the alternation of 

 "wider and narrower vertebra?, and by the edges of the former over- 

 lapping 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 arrange- 

 ment of the vertebras 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 fromWenlock, 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 ra- 

 mose 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 vertebrae 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 vertebra?, 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 pro- 

 trusions, in which a central foramen is observable. By these pro- 

 ections from the sides of the vertebrae, the column acquires a rough 



