SYSTEMATIC 

 AREANGEMENT OF INFUSORIES. 



CLASS I. 

 INFUSORIA. 



MICROSCOPIC animalcules, often of mutable form, without 

 nervous system and vessels, mostly with internal globose cavities, 

 moving by means of vibratile cilia, or exsertile processes, without 

 true articulated feet. 



From a definition all that is uncertain and hypothetical must be 

 excluded as far as possible. Hence we do not call the internal cavities, 

 which are seen in most Infusories, stomachs. Our class, limited 

 as above, contains several of the Polypes gelatinaux of CUVIER, 

 and agrees with the Polygastrica of EHRENBERG. Many genera, as 

 JBacillcvria, Navicula, Closterium, are omitted, because it is highly 

 probable that they belong, as many writers have admitted, to the 

 vegetable kingdom. 



ORDER I. Simplicissima. 



Naked, extremely minute, external organs none, form persistent. 

 Family I. Vibrionidce. Body filiform. 



Vibrio MUELL. (exclusive of many species.) Genera : Bacterium, 

 Vibrio, Spirillum EHRENB. 



Sp. Vibrio lineola MUELL., EHRENB. (and Monas termo MUELL. ?) MUELLER, 

 Infus. Tab. vi. fig. i ; EHRENBERG, Infusionsthierchen. Tab. v. fig. 4 ; in 

 different infusions, &c. 



ORDER II. RMzopoda DUJARD. (Pseudopoda EHRENB. in part). 



Animalcules with mutable form, moving by means of multiform 

 exsertile processes, without vibratile cilia or other external organs. 



