CXVIU 
DIV. IV.— RADIATA, 
CLASS V.— INFUSORIA. 
Microscopic animals, in general of extreme simplicity of organ- 
ization. Some of the genera, however, appear to be more compli- 
cated, though the details of their organization escape the deepest 
powers of the microscope. 
The class is divided into two orders. 
Class. Order . 
T f 1. Rotifera. 
Infusoria . .< 0 tt 
(2. Homogenea. 
ORDER I. — Rotifera. 
Body oval and gelatinous ; a mouth, stomach, intestines, and 
arms have been observed. The mouth or head is surrounded by 
denticulated lobes, which vibrate with great rapidity, and present 
the appearance under the glass of a revolving wheel. 
Genus. Subgenus. Example of Species. 
( 1. Furcularia, prop. ..F. 
Furcularia . < 2. Trichocerca, Lam. . . Tri. paxillum, Mull. 
V. 3. Vaginicola, Lam. ..Tri. innata, Miill. 
Tubicolaria, Lam. Vorticella tetrapetala 
Brachionus, Mull, 
