194 



by the annexed figure, Plate XV. Fig. 2, the central pentagonal 

 part, projecting in a more rounded form, and with the same sweep 

 with the five surrounding and including pieces ; whilst, in the cor- 

 responding base of the former species, the central part is considera- 

 bly sunk. 



What was the form of the rest of the pieces constituting the pelvis 

 for the reception of the body of the animal ; or what was the shape 

 of the ossiculae forming the arms, fingers, tentacula, c. ; or in what 

 manner these were given off and divided, are questions which I 

 do not possess the means of solving. Numerous ossiculse, however, 

 are observable on the surface of the matrix ; but their forms are 

 not seen with sufficient distinctness to allow them to be clearly made 

 out. 



Whilst this sheet was in the hands of the printer, I was favoured 

 with a letter from Stevens, Esq. of Bakewell, near Chats- 

 worth, informing me, that he was in possession of the only head, or 

 superior part of the Derbyshire encrinite, that he had heard of. The 

 sketch which Mr. Stevens sent, at once assured me, that this encri- 

 nite differed essentially in its general form, as well as in the arrange- 

 ment and division of its limbs, from any encrinite which I had seen. 

 Anxious to fill up the chasm which existed in the natural history of 

 this curious, animal, I gladly accepted of this gentleman's very 

 obliging offer of the opportunity of having a drawing made from his 

 specimen, and of presenting to my readers its correct representation y 

 Plate XV. Fig. 9- This fossil presents, at first sight, a sufficient dif- 

 ference in its general outline to authorise the conclusion of its being 

 of a different species from the lily encrinite of Germany. 



By a closer examination of this interesting fossil it will be seen, 

 that from a pentagonal base, similar to that which, has been just de- 

 scribed, as the supposed pentagonal base of this encrinite, ten arms 

 proceed, as in the lily encrinite, but which soon assume a very diffe- 

 rent character from those of that fossil. In the lily encrinite, each 

 of the arms divides at the same distance, and in the same manner ; 



