Af) 
tinuation through a considerable length of the column, before it becomes eon- 
fined to a more limited flexibility. 
From the fine specimen figured by Knorr, it is obvious that the animal 
had no auxiliary side arms, and as the superior part is less ponderous than 
that of Apiocrinites, we may easily account for its being sustained without 
them on a longer column. 
The Base (Pu.1. fig. 2.) Rostyus Harrensere, Watcu, and Mr. ParKtn- 
son, suggest the idea that the animal was permanently affixed by exuded cal- 
careous indurating secretions, and figure specimens found in the same places 
where the lily-shaped superior portions of the animal occur. Although I have 
not myself seen any of these bases, yet from these representations much resem- 
bling the attaching laminar portion of Apiocrinites rotundus, I cannot hesitate in 
admitting the accuracy of the observations of the authors above quoted. Hence 
it iseasy to explain the manner in which several of the encrini adhered together, 
having early commenced life near each other, and become enclosed at the base 
by the exuded calcareous matter as they grew up, yet without forming one 
animal as WaALCH suggests. 
Superior Extremity. (Px. 11.) This part in the number and disposition 
of its joints, presents many general analogies to the corresponding portions in 
the preceding genus Apiocrinites which have been already largely described, yet 
with considerable subordinate variations of form, priucipally arising from the 
upper joints of the column continuing of the same size with the lower, and the 
consequent narrow area occupied by the pelvis, which in this species forms the 
commencement of the swelling part, exhibiting a calix-like figure; hence the 
contiguous parts are obliged to undergo such modification as may accommodate 
them to this figure. 
The First Cotumnar Joint (Pu. au. fig. 1.) is of a pentangular form, and 
one of those of larger dimensions which alternate in the superior part of the 
column it articulates, by its striated exterior rim, like the other joints, and has 
in its centre the pentapetalous entrance to the alimentary canal probably 
guarded by a sphincter muscle. 
The Pexvis (Pu. 111. fig. 2. to 4.) is formed of five depressed rhombic joints, 
