OF ANIMALCULES. 85 



indigo into the water they are greatly agitated ; in a few 

 minutes, however, they are quiet, and the digestive sacs 

 become coloured, as in the drawing, when from 100 to 

 200 may be enumerated. Length, l-85th to l-200th of 

 an inch. (See Book III.) 



143. Paramaecium aurelia. — This animalcule has so 

 strong a resemblance to the preceding one, that it is un- 

 necessary to notice it further, than by stating, that its 

 extremities are more pointed. (See figure 68.) Size, 

 l-200thofaninch. 



144. Paramaecium compressum, E. — l-200th long; 

 new species. 



45. ■ ^ ovatum, E. — l-280th long ; new 



species. 



146. versutum. — *' Cylindrical animal- 

 cule, the lower part thick, both extremities obtuse ;" it 

 is often of a green colour. 



147. Paramaecium oviferum. — This creature has its 

 interior filled with large egg-shaped molecules. Figure 

 69 represents one undergoing division. 



148. Paramaecium marginatum, — This large species 

 is the shortest of the genus in proportion to its breadth. 

 Figure 70 shews it magnified, with its pellucid margin. 



