SECTION III. 



THE INFUSORIA OR CILIATA. 



THE Infusoria or Ciliata are now regarded as the high- 

 est representatives FlG - 742 - 

 of the Protozoa, ex- 

 cepting only the 

 sponges. 



Two or three 

 forms will give the 

 student a general 

 idea of this group. 

 Those called Yor- 

 c ticellse, or the Bell- vorticeiia. 

 shaped animalcules (Fig. 742) 

 are common on aquatic plants. 

 They are in the form of cili- 

 ated bells mounted on long 

 stalks. They are visible to the 

 naked eye. 



th The Trumpet animalcules 

 (Stentor polyinorplius, Ehren., 



p Fig. 739) secretes a sort of tube 

 into which it contracts when 

 disturbed which Dr. Packard 

 calls an anticipation in nature 

 of the worm in its tube. 



One of the most simple and 

 most common forms of Infusoria 

 is Paramecium (Fig. 741, from 

 Clark's "Mind in Nature"), 

 which is hardly more than a 

 particle of protoplasm, repre- 

 senting, perhaps, only a single 

 cell. Yet it is regarded as 

 having a so-called mouth, digestive cavity, etc. 



Paratnecium cmtilatum , Ehrenberg 

 Magnified. 



3, radiating canals of cv' ; r. repro- 

 ductive organic, vibrating cilia. 



