150 DROPS OF WATER. 



vibratory cilia ; below this apparatus are seen the 

 grinding jaws in motion. The animal frequently 

 bends its body, first to one side, and then to the 

 other, as if it were looking over its dark case for 

 prey ; and at that time are seen several processes, 

 which form part of the body. The Melicerta, 

 another genus of stationary Rotatoria, has four 

 lobes : the case has a granulated appearance, 

 and is of a brownish-red colour. 



Of the free genera of this class, a few species, 

 more highly interesting and more common than 

 the rest, can be alone described. 



Microcodon cto^(Drop IV. fig. 3) is a beautiful 

 little animalcule, being in shape like a bell, with 

 a long undivided foot, which it has the power 

 of bending at right angles to its body ; the rota- 



