40 



tinuation through a considerable length of the column, before it becomes con- 

 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 (PL. i. fig. 2.) ROSINUS HAKKENBERG, WALCH, and Mr. PARKIN- 

 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 is easy 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 WALCH suggests. 



SUPERIOR EXTREMITY. (PL. n.) This part in the number and disposition 

 of its joints, presents many general analogies to the corresponding portions in 

 the preceding genus Apiocriuites which have been already largely described, yet 

 with considerable subordinate variations of form, principally arising from ihe 

 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 COLUMNAR JOINT (PL. m. 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 PELVIS (PL. in. fig. 2. to 4.) is formed of five depressed rhombic joints, 



