97 



Derbyshire ; the remains thus preserved forming a most 

 useful and ornamental marble. But extraordinary as it 

 may appear, although these remains exist to so immense an 

 extent, only one body, with the arms, &c. of the animal, has 

 been yet stated to have been found; and this was so far 

 imbedded in its matrix, as to restrict our knowledge of the 

 structure of the animal to the particulars above-mentioned. 

 Organic Remains, vol. ii. PI. xv. fig. 9. 



Sp. 3. The turban encrinite. The existence of this 

 species was only made known by the preservation of its 

 pentagonal base with some indistinct fragments, in a spe- 

 cimen of limestone of the earliest formation, from Wenlock 

 edge : the superior elegance of the form of the pentagonal 

 base, PI. ix. fig. 7, decidedly marked this animal to be of a 

 different species from the preceding. 



The radical termination or organ of attachment of this 

 animal, Organic Remains, vol. ii. PL xv. fig. 5, manifests a 

 very curious structure : it terminates in very frequent 

 ramifications, which are jointed by numerous crenulated 

 articulations, admitting a certain degree of mobility. 



The limestone in which the remains of this animal are 

 found also contains the remains of madrepores and tubipores, 

 particularly of the chain-coral: the antiquity of its depo- 

 sition is manifested by its being repeatedly seen alternating 

 with sandstone, above the coal. 



Sp. 4. The pear encrinite (Organic Remains, vol. ii. 

 PL xvi.) The radical termination or organ of attachment 

 of this species is of a flat and extended form, and possesses 

 a purplish hue. It has the appearance of having been ori- 

 ginally covered by several coats of a ligamentous or car- 

 tilaginous substance possessing crenulated articulations: 

 from this proceed the vertebrae, which are very thin and 

 finely crenulated, and at their lower termination participate 

 with their base in a portion of membranous or cartilaginous 

 matter, which is extended over them. As they approach 



o. 



