136 DESCRIPTION OF {Tolygastnca. 



terminated by a long straight, and A-ery thin tail. Length of body 

 1-2600. Length of tail the same. 



Cyclidiu-m: truncata. — Body contracted posteriorly, ti'uncate in 

 front, and having a filament springing fr-om each of the truncated 

 angles, the other angle being extended more or less into a lobe. 

 Length l-3000th, l-1900th. 



C. lobata. Body variable in form, tubercular, sending out a flageUi- 

 form filament from the end of an anterior lobe, and emittiag also one 

 or two other lobes. Length 1-3250, 2-3250. 



Before proceeding with the next genus it is right to mention that 

 Dujardin has noted the occurrence of several of the above Cerco- 

 monads, in organic infusions in conjunction, particularly with Monas 

 lens, and that he inclines to the idea of these differently named 

 Infusoria, being but different conditions of the same animalcule. 



Genus AiiPHiMONAS. (Duj.) — Animal of variable uregular form, 

 having at least two filaments, of which one is either in front, and 

 the other on one side, arising from a consti'iction of the body, or 

 both are lateral, and accompanied or not with a caudiform prolonga- 

 tion. The leajiing movements of these creatures offer a good character. 



A. dispar. Body oblong, of veiy vaiiable form, one or other of 

 its ends constricted, or prolonged laterally into two filaments, or ex- 

 hibiting them approximated at the anterior extremity. Length 

 1 -3500th to 1 -2900th. Movement active, jerking. 



A. caudata. — Body of very variable form, mostly depressed, tuber- 

 cular, convex on one side, angular on the other, with a filament 

 proceeding from the summit of each angle. Length 1-21 80th to 

 1- 1300th. 



" This species seems to me (says Dujardin) to be allied to the Bodo 

 saltans of Ehrenberg. In every example I saw two flagelliform 

 filaments, one fi-om the anterior, the other fi-om the lateral angle ; a 

 caudiform prolongation obtuse, or drawn out as a third filament, 

 often adhered to the slide." 



A. hrachiata. — Under tliis name is indicated an animalcule of the 

 family Ilonadina, which Dujardin only once met with, of an ovoid 

 or pjiifonn shape, filled with granules, and giving off from its 

 narrower anterior end, a simple flexuous filament, together with a 

 variable dilated lobe, emitting two other filaments having an undu- 



