Monadina.} THE INFUSORIA. 103 



are devoid both of the eye and tail. Whether the projecting 

 lip is furnished with cilia, or with a double flageliiform 

 proboscis, Ehrenberg has not satisfactorily determined. 

 He states, however, that two proboscides are to be dis- 

 tinctly seen on the C. paramecium, whilst on the C. des- 

 truens there are a number of cilia, which are not quite so 

 apparent. Their self- division is either simple and complete, 

 or they do not divide. 



42. CHILOMONAS volvox. The rolling Chilomonas. 

 Form ovate ; attenuated and truncated anteriorly ; transpa- 

 rent and colourless ; projecting lip long ; they will feed on 

 indigo. Found in stagnant water. Size l-1440th. 



43. CHILOMONAS paramecium. The triangular Chilo- 

 monas. Form oblong, keeled longitudinally, colour resem- 

 bling dirty water. This animalcule is easily distinguished 

 by its shape and peculiar lip-like process. With a power of 

 about 240, numerous digestive cells are visible ; and with 

 380, the two proboscides, 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 

 creatures magnified 380 times, and six others less magnified. 

 Three are clustered. Found in water wherein wheaten 

 bread has been steeped. Size 1 -1020th. 



44. CHILOMONAS destruens. The destructive Chilomonas. 

 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 (Anuroea foliacea 

 and Monocerca rattus). Size 1 -860th. 



Genus IX. BODO. The tailed Monads. The caudal 

 appendage at the posterior extremity of these animalcules is a 



