1/4 NATURAL HISTORY 



drical, with the tail forked, and capable of being drawn 

 within the animalcule. 



409. VoRTicELLA cciuicula. — This diaphanous creature 

 bears some likeness to the F. senta, with a slight con- 

 traction or neck : the tail is forked, and united by two 

 joints to the body. 



410. VoRTicELLA ctttalus. — ^This creature has a small 

 tail; the body is slightly bent, spotted, and furrowed, 

 with several longitudinal folds; the rotatory cilia are 

 numerous. Found in stagnant water. 



411. VoRTicELLA ^oscw/o^ct. — This is a clustering Ro- 

 tatoria : numbers of them may be seen attached to the 

 stems of water-plants, and forming a globular cluster : 

 when separate they swim about, and extend their rota- 

 tory organs. Figure 230 represents a cluster, of the real 

 size, attached to a stem of hornwort; and figure 239 is 

 a single one, magnified. 



