104 DESCRIPTION OF [Poly gastric a. 



decisive character of the genus Bodo. In other respects, 

 the species may be described as being eyeless, and having 

 the terminal mouth furnished with a single (?) filiform pro- 

 boscis, and as undergoing self-division, simply and com- 

 pletely into two, or not dividing at all. These creatures 

 never constitute true or perfect clusters, like some of the 

 family Monadina, although, like the Uvellathey occasion- 

 ally enter into social compact. In the species B. grandis, 

 several digestive sacs have been observed, and (as also in 

 the B. intestinalis) a simple (perhaps double?) proboscis, 

 its organ of locomotion. The Bodo didymus has been 

 known to divide transversely. Only one of the species of 

 this genus having fallen under my own investigation, the 

 account of them here given is entirely abstracted from Die 

 Infusionsthierchen. 



45. BODO intestinalis. The intestine Bodo. Form 

 almost conical ; tail of equal length with the body ; trans- 

 parent and colourless. Found in several living animals, 

 such as frogs, toads &c. In the grey and edible frogs, 

 amongst the watery mucus of the alimentary canal, Ehren- 

 berg has observed great numbers of these creatures, and 

 remarks that the Cercaria gyrinus of Miiller (a different 

 animalcule) might pass as a representation of this species, 

 and that it was confounded by its discoverer with the 

 spermatic animalcules. Group 20 represents them mag- 

 nified about 300 diameters. Size 1-1 720th. 



46. BODO ranarum. The frog Bodo. Body turgid, 

 ventricles indistinct. Found in live frogs, with the pre- 

 ceeding species, and with the Bursaria ranarum. Size 

 l-1440thc 



47. BODO viridis. The green Bodo. Form nearly glo- 



