6i4 



H. S. "Jennings 



it took various forms, of which the three given in Fig. i6, r, d, e 

 are types. This structure took food by five or six mouths, and had 

 a number of partly independent systems of circulation. It reached 

 a length of 450/i, with a breadth of 150W. The normal Paramecia 

 in the same culture in which it occurred showed dimensions of 

 about 150/^ X 6o;f. This structure had therefore the bulk of 

 about twenty normal individuals. 



This was kept for ten days, but finally it disintegrated. 



Fig. 16 Irregular individuals which do not divide farther, a and h are separate individuals that 

 finally died, c, d and e are stages taken at intervals of several days in the complex mass ar. m, mouths. 



f Behavior of Mutilations in Reproduction 



Paramecium differs from many of the infusoria in the fact that 

 it does not stand mutilation well. The internal contents seem 

 very fluid, so that they flow out as soon as the ectosarc is cut; the 

 animal at once disintegrates. It is therefore difficult to study 

 the regulation of injuries in this animal, either during the active 

 life, or at reproduction. 



However, from a large number of experiments, certain results 

 were reached that show how mutilations behave, both in ordi- 

 nary regulation and in reproduction. 



