146 ANIMALIA RADIATA. 



**; 



ORDER II. CORALLIFERL 



Animals united in great numbers to form composite ani- 

 mals, protected and sustained by solid matters called polypiers, 

 internal or external ; nutrition, sensibility and will in com- 

 mon. Such are the Sponges, Madrepores, Tubipores and 

 Coral. 



INFUSORIA. 



Little microscopic beings swarming in still waters ; the 

 greater number gelatinous and without viscera : at their head 

 we place the species with the most complex organization. 

 Two orders. 



ORDER I. ROTIFERA. 



Body oval; a mouth ; a stomach ; an intestine ; and a tail ; 

 anteriorly a singular organ, which, by its vibrations, gives 

 the appearance of revolving wheels. 



ORDER II. HOMOGENEA. 



No viscera ; often not even the appearance of a mouth. 



