80 EXPLANATION OF PLATE 47. 



The length of the jointed flexible stems has been 

 taken from some entire stems in the collection of Mr. 

 Channing Pearce of Bradford, near Bath. Two 

 young individuals are attached to the calcareous 

 Pedicle or Base of the largest specimens. (Miller.) 



Fig. 2. a. represents the remedial effect of calcareous 

 secretions in repairing an injury of the joints of the 

 stem. (Miller.) 



Fig. 3. Pyriform Body of Apiocrinites rotundus, show- 

 ing at its upper extremity the internal disposition of 

 the bones surrounding the cavity of the stomach. 

 (Original.) 



Fig. 4. Vertical section of another pyriform Body, show- 

 ing the cavity of the Stomach, and a series of lower 

 cavities, or hollow lenticular spaces, between the 

 central portions of the enlarged joints of the upper 

 portion of the vertebral column. Miller considers 

 these spaces as enlargements of the alimentary canal, 

 which descends through the axis of the entire co- 

 lumn. 



The surfaces of the joints of the vertebral column 

 are striated with rays, which articulate with corre- 

 sponding rays on the adjacent Plates, and allow of 

 flexure without risk of dislocation ; locking into one 

 another nearly in the same manner as those figured 

 in PI. 49. Figs. 5. 7. 9. (Original.) 



Fig. 5. Restored figure of Apiocrinites, 30-Dactylus, 

 copied from Miller's Crinoidea, Page 96, PI. 1. Fig. 

 2. (See V. I. p. 323. Note.) 



B. Base and fibres of attachment. 



D. Auxiliary side Arms.* 



* These side arms afford a beautiful example of mechanical adap- 

 tations and compensations, which are thus described by Mr. Miller 



