1S2 



ZOOLOGY. 



in most other animals ; and the different parts of the economy, 

 instead of being disposed in pairs on each side of a longitudinal 

 plane, are grouped around an axis or central point, > 

 give to the Whole of the body a radiated or spherical form. 



Fig. 467. Encrines (Encrinus). 



The nervous system is either rudimentary or wanting ; and 

 there are no special organs of sense, unless it be certain small 

 coloured spots, bearing some analogy to the eyes of the 

 mollusca. In structure, these animals differ widely from each 



