INTESTINAL CANAL 



29 



they have an intestinal canal with two orifices, one 

 for the entrance, and the other for tlie exit of their 

 food. Both these orifices are, to nse the langnage 

 of the "Micrographic Dictionary," situated in the 

 Here we have to notice two things. 



Vorticella, with posterior circlet of cilia Vorticella in process of sclf-divisiou. A 



in process of separation, aOO linear. - new frontal wreath in formation in each 

 Stein. of the semi-lunar spaces. 



both of which indicate some elevation in the scale 

 of being. In tlie first place there is an intestinal 

 tuhe^ or distinct channel; while in the lowest ani- 

 mals, such as the Amoeba or Protean animalcules 



