100 DESCRIPTION OF [Polygastrica. 



36. PHACELOMONAS pulvisculus (Monas pulvisculus, M.) 

 The green Phacelomonas. This creature is of an oblong 

 or slightly conical form, attenuated posteriorly, and of a 

 beautiful green colour. Just previous to self- dividing its 

 body becomes cylindrical, and then contracts at the centre ; 

 but when dying it changes to a globular shape. In swim- 

 ming, it turns quickly upon its longitudinal axis, without 

 any vibration. This animalcule demonstrates the fact, that 

 proboscides and cilii are organs not materially different 

 from each other. Found in green puddles. Size l-1152nd. 



Genus VI. GLENOMORUM. The bride Monad. This 

 genus is especially indicated by its possessing a single red 

 eye, a truncated mouth, and double filiform proboscides; by 

 its being destitute of a tail, by the individuals moving on 

 the long axis of the body, by their self-dividing simply and 

 completely into two, or not dividing at all ; and by their 

 voluntarily clustering, as occasion may require, so as to 

 give themselves the resemblance of a bunch of grapes. 



In this enumeration of the characters belonging to this 

 genus, we are presented with an excellent illustration of 

 the table (and one that exceedingly well explains its use), 

 under which all the genera of the family Monadina are 

 arranged, so as to exemplify in what respects they are alike, 

 and in what they differ from each other. (For example, see 

 Table, p. 88.) The Glenomorum closely resembles the 

 Uvella, but differs from them by the superaddition of the 

 red eye; it differs from Monas and Microglena through oc- 

 casionally aggregating; from Chilomonas, in being deficient 

 of the projecting lips ; from Bodo, in not having the tail ; 

 from Phacelomonas, by the double proboscis ; from Doxo- 

 coccus, by swimming, instead of rolling over or revolving 



