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DESCRIPTION OF PLATE HI. 



THE VORTICELL^, OR BELL-SHAPED ANIMALCULES. 

 ( Page 42. ) 



[All the Figures highly magnified.'] 



Fig. 1. The Arborescent Vorticella, {Carchesium polypinum), seen with 



a low power. This group is formed by the spontaneous 



fissuration being incomplete. See p. 48. 



a, fl, Two individuals thrown off from the parent stem. An 



enlarged view of one of these liberated animalcules is 



shewn in fig. 4. 



Fig. 2. One of the Vorticellse of fig. 1, highly magnified, shewing the 

 process of fissuration, by which one animalcule becomes two 

 individuals, each supported by a stem, and continuing at- 

 tached to the parent trunk ; p. 48. 



Fip. 3. A group of Vorticellse, {Vorticella nebulifera), representing the 

 animalcules in various attitudes. Some are single, others 

 have divided into two ; some are extended, others have 

 their pedicles or stems more or less spirally contracted ; in 

 several instances the pedicles are destitute of bodies, the 

 animalcules having broken the connexion, and swam off; 

 p. 44. 



Fig. 4. An animalcule of the group fig. 3, separated from the pedicle, 

 and having a row of cilia at the base; p. 47. 



