INFUSORIA. [ 348 ] INFUSORIA. 



that the characters relating to the gastric 

 apparatus are not generally admitted to be 

 correct. 



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. 



Carapace none Tp , ,, t>i- in/ Amceb^a. 



Carapace present / ^ ^ P ^\ Arcellina. 



Expansions absent. 



Not furnished with cilia or setae on the surface. 

 Form of body variable. 



Carapace present Dinobryina. 



Carapace absent Astasi^a. 



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 Vorticelltna. 



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. 1. AMCEB.EA. Naked, creeping, incessantly changing their form. 



Fam. 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. 

 5 $ . Isolated. Swimming. 



