INFUSORIA. [ 348 ] INFUSORIA. 



The remaining families are arranged in 

 the subjoined table according to Ehrenberg's 

 system, although it must not be forgotten 



A. Intestinal tube absent. Anentera. 



Body emitting foot-like expansions. 



that the characters relating to the gastric 

 apparatus are not generally admitted to be 



correct. 



Expansions absent. 



Not furnished with cilia or setae on the surface. 

 Form of body variable. 



Carapace present ...................................... DINOBRYINA. 



Carapace absent ...................................... ASTASI^EA. 



Cilia or setae present on the surface of the body or the carapace. 



Carapace present ...................................... PERIDIN^A. 



Carapace absent ...................................... CYCLIDINA. 



B. Intestinal tube present. Enterodela. 

 Orifice single. Anopisthia. 



Carapace none ........................................ VORTICELLINA. 



Carapace present ...................................... OPHRYDINA. 



Two orifices at opposite ends of the body. 



Carapace absent ...................................... ENCHELIA. 



Carapace present ...................................... COLEPINA. 



Orifices differently placed. Allotreta. 

 Carapace none. 



No tail ; a proboscis present .......................... TRACHELINA. 



Tail present, mouth anterior .......................... OPHRYOCERCINA. 



Carapace present ...................................... ASPIDISCINA. 



Orifices ventral. Catotreta. 

 Carapace absent. 



Motion effected by cilia .............................. COLPODEA. 



Motion effected by organs ............................ OXYTRICHINA. 



Carapace present ...................................... EUPLOTA. 



According to Dujardin's system, the Infusoria are arranged as follows (excluding those 

 certainly belonging to the Algae). 



Body asymmetrical, or not composed of two similar lateral portions. 

 Sect. 1. Furnished with variable expansions. 



* Expansions visibly contractile, simple or frequently branched. 

 Fam. I. AMCEB^A. Naked, creeping, incessantly changing their form. 



Fain. 2. RHIZOPODA. Creeping or fixed; secreting a more or less regular shell or 

 carapace, from which incessantly changing expansions are exserted (Arcellina, 

 Ehr.). 

 ** Expansions very slowly contractile, always simple. 



Fam. 3. ACTINOPHRYINA. Animals almost immoveable (Acinetina, Ehr.). 



Sect. 2. Furnished with one or more flagelliform filaments which serve as locomotive 

 organs ; no mouth. 



* No integument. 



Fam. 4. MONADINA. Swimming or fixed. 

 ** With an integument. 



$ . Aggregate. Floating or fixed. 



Fam. 5. DINOBRYINA. Teguments connected at one point, forming a branched poly - 

 pidom. 

 $ $ . Isolated. Swimming. 



