ARTICULATED ANIMALS. 



83 



that ill the former the nervous centres are nume- 

 rous and feeble, corresponding with the imperfection 

 of the organs of sense and the absence of limbs, 

 whereas in the latter they are proportionately large 

 and few in number, adapted to the possession of 

 senses of a higher description, and limbs endowed 

 with great strength and activity. 



The Articulata are divided into five principal 

 classes, as represented in the following table : — 







PQ 



•sivwiiiv aaxvTaoiisv 



