O 
The disposition of these striz is as follows; from the centre of an plate a ridge 
proceeds to each side of the polygon formed by it, bisecting each of the trian- 
gular areas into which it may be resolved ; all the other strie contained in each 
of these areas are parallel to this first. (See fig. 1.) The configuration of the 
contiguous plates being similar and adapted to each other, the markings proceed 
over them in the same direction, thus producing a series of triangular striae, 
arranged in such a manner that the ramifications from three contiguous plates 
contribute to compose a single triangle. This disposition, which is common to 
this and nearly all the following genera, will be better understood by an inspec- 
tion of the plate, than from any verbal description. These rugged ridges ap- 
pear to have resulted from the ramifying structure and contraction of muscles 
adhering to the centre of each plate, where a rough and granular surface indi- 
cates the points of their attachment, and thence acting partly towards the arms 
to produce their motion, and partly towards the pelvis and column. 
The fibres at the base of this animal are frequently found entangled in the 
branches of a coral, which I have called in my manuscript catalogue Hexapora 
Cyathocrinoidea. 
It is this species whose superior portion and the markings ofits plates bear 
great resemblance to the Marsupite (a name proposed by GIDEON MANTELL, 
Esq. of Lewes, in his manuscript account of the Southdown fossils), or Tor- 
toise Encrinite of Mr. Parkinson, which animal forms the approximating 
genus or intermediate link between this family and the genus Euriale of 
LAMARCK. 























