132 DESCRIPTION OF [Polygustrica, 



sembling dirty water. This animalcule is easily distingxiished by its 

 shape and peculiar lip-like process. With a power of about 240, 

 numerous digestive cells are visible ; and with 380, the two probos- 

 cides, which are half the length of the body, may be perceived. It 

 moves in the direction of its long axis, but in a fluctuating or 

 wavering manner. It sometimes clusters. Group 19 represents two 

 of these creatiu'es magnified 380 times, and six others less magnified. 

 Three are clustered. Found in water wherein wheaten bread has 

 been steeped. Size 1-1 020th. 



Chilomonas destruens. — Form oblong, but variable, on account of 

 its softness. Faint yellow, nearly colourless. Found in salt and fresh 

 water, and in the bodies of dead Rotatoria, for instance, Anuraa 

 JoUacea, and Monocerca rattus. Size 1 -860th. 



C. granulosa (Duj.) — Body colourless, oblong, larger anteriorly 

 than posteriorly, of almost invariable form, although of gelatinous 

 consistence, filled with granules which seem to project from its sur- 

 face. Filament flagelliform, very fine, arising from an oblique notch. 

 Length l-940th to l-850th. 



C. ohiiqua. — Body ovoid, or pyrifonn, nodular of variable form, 

 with its filament arising laterally. Length 1 -2600th. 



Genus BoDO. The tailed Monads. The caudal appendage at the 

 posterior extremity of these animalcules is a decisive character of 

 the genus. In other respects, the species may be described as being 

 eyeless, and ha%-ing the terminal mouth furnished with a single (?) 

 filiform proboscis, and as undergoing self- division, simply and com- 

 pletely into two, or not dividing at all. These creatures never con- 

 stitute true or perfect clusters, like some of the family Monadina, 

 although, like the UveJIa, they occasionally enter into social compact. 

 In B. grandis, several digestive sacs have been observed, and (as also 

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

 B. didymus has been known to divide transversely. Only one of the 

 species of this genus ha^^ng fallen under my own investigation, the 

 account of them here given is entirely abstracted from Die Infusions- 

 thicrchen. 



This genus Bodo partly comprehends the genera Kexamita, A^npM- 

 tnonas, and Cercomonas, of Dujardin, which are with others introduced 

 S5 addenda to this family Monadina. 



