a SYSTEMATIC 
ARRANGEMENT OF INFUSORIES. 
CLASS IL. 
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 gelatinaua of CUVIER, 
and agrees with the Polygastrica of EHRENBERG. Many genera, as 
Bacillaria, Navicula, Closteriwm, are omitted, because it is highly 
probable that they belong, as many writers have admitted, to the 
vegetable kingdom. 
Orver I. Stmplicissima. 
Naked, extremely minute, external organs none, form persistent. 
Family I. Vibrionide. 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. 1; EHRENBERG, Infusionsthierchen. Tab. v. fig. 4; in 
different infusions, &c. : 
OrverR II. Rhizopoda Dusarp. (Pseudopoda EMRENB. in part). 
Animalcules with mutable form, moving by means of multiform 
exsertile processes, without vibratile cilia or other external organs. 
