50 
part of this animal, so far as the state of the specimens of this species have 
allowed me to trace them, it perfectly resembles Apiocrinites rotundus. As in 
that species, the SUPERIOR COLUMNAR JOINT is on its upper surface divided by 
five ridges, admitting in the concave spaces the five joints of the pELvis, each of 
these terminate above in an elevated ridge, and in the interstices between 
them the insertion of the five FIRST COSTAL JoINTs takes place. The funnel- 
shaped cavity in the centre, resembles that of the former species. The exterior 
muscular integument sometimes appears to have hidden the insertion of the 
joints, (4.) and its contraction will account for the folds which occasionally occur 
on the surface. I have as yet seen no specimen continued beyond the first 
costal joint, but apprehend that the following ones, the scapula, &c. will also 
be found to resemble those of Apiocrinites rotundus. 
The Stratcut BotrLe Enceinite described by Mr. Parxrnson, is, pro- 
ably, only a young individual of our species, or perhaps, a much contracted 
specimen, having apparently hardly sufficient character to be considered as a 
wariety. 
The Stac-Horn Encrinirte of the same author, I apprehend to be part of 
the column of our species, near the base sending off its auxiliary fibres, and 
thereby forming a fascicular ramifying root, by which the animal attached itself 
to extraneous substances. That these specimens really formed the roots of our 
present species, and not portions of a distinct animal, I am induced to believe 
from having noticed that the mode of articulation of their joints when it can be 
clearly traced, appears to me to present the same character as has been noticed 
in the columnar joints described above; and although the proportions of these 
radical joints are much thinner, broader, and frequently irregularly bevelled, so. 
as at first sight to militate against this appropriation ; yet a similar difference 
between the upper columnar and radical joints of other genera, will hereafter 
he pointed out. 
