INFUSORIA. 53 
c. Foraminifera. —Ex. Lagena, Nodosaria, Discorbina. 
d. Radiolaria.—Ex. Acanthometra, Haliomma, Thalassicolla. 
e. Spongida.—Ex. Spongilla. 
Ciass III. INFusoRIA.—Protozoa with a mouth and rudimentary 
digestive canal; destitute of the power of emitting pseudopodia ; fur- 
nished with vibratile cilia or contractile filaments ; the body usually 
composed of three distinct layers. 
a. Ciliata.— Ex. Paramcecium, Epistylis. 
6. Suctoriaa—Ex. Acineta. ; 
c. Flagellata.— Ex. Peranema. 
