THE CILIATE INFUSORIA. 



35 



cu 1 



II 



III 



n 

 m 



cv 



H 



ers, so that when the organism has by means of its hollow 

 armrf or tentacles caught some 

 Infiieorian, the arms con- 

 tract, draw the victim nearer 

 to the Acineta, and when the 

 sucking disk at the end of the 

 arms has penetrated the skin, 

 the contents of the body of 

 the Infusorian are sucked into 

 the food-cavity of the Acine- 

 ta ; on the other hand, in 

 some Acinetre a portion of the 

 arms are simply prehensile. 

 These animals are in their 

 adult phase cpiiite unlike the 

 Flagellata or Ciliata, but the 

 young are developed within 

 the parent and are provided 

 with cilia, being at first free- 

 swimming, and afterward 

 fixed by a long stalk. The 

 AcinetcB sometimes self -di- 

 vide, sending off from the 

 free end of the body a ciliated 

 Acinete ; they have also been 

 seen to conjugate. 



Order 3. Ciliata (Infuso- 

 ria). A common type of this 

 group and one easy to obtain 

 by the student is Parame- 

 cium (Fig. 24), observed in 

 infusions, or moving rapidly 



,T i -,. ,,-, . Fig. 24.Paramecium caudatum. A 



the bodies OI larger am- view from the dorsal bide, imitfiufled 3-10 



a, 



mals which may be under the fi2S, 

 microscope. Figure 24 rep- 



rp<?pnts Pftrf/mcrium rmirlft- vesicles; I, n, in, the radiating canala of 



cauaa CT ,. n ^ the re p roducfivc ,,^,,1; , the 



tum Ehrenberg. This ani- l"ge vibrating cilia at the edge of the ves- 

 tibule. After H. J. Clark. 



malcule is a mass of proto- 

 plasm, representing a single cell. In the body-mass are ex- 



