38 



NATURAL HISTORY 



its form, but always in a regular order ; first extend- 

 ing the lower end, which is terminated by a fine point, 

 then swelling out the fore part into a globular mass ; and 

 thus, by alternate contractions and dilatations, it draws 

 itself forward in the water, which it does very slowly. 

 It is found in river-water, and shewn magnified at 

 figure 7- 



The above are the only species given by Muller. 

 Ehrenberg has observed another, which he has named — 



24. Amoeba radiosa ; it having variable acute ra- 

 diated processes. 



