225 



multiple, the original individual giving rise, simultaneously, to three 

 or four descendants. 



T. lewisi differs from most Trypanosomes in that the cytoplasm 

 generally * divides in a very unequal manner (Fig. 20). Indeed, 

 the process is more comparable to budding, since the larger or 

 parent individual may produce, successively, more than one 



FIG. 20. 



Unequal division in T. lewisi. m, parent-individual ; <7, daughter-individual ; rf 1 , daughter- 

 individual dividing, x 2000. (A-E after Lav. and Mesn. ; F after Wasielewsky and Senn.) 



daughter-individual ; moreover, the progeny may themselves sub- 

 divide before separating, the whole family remaining connected 

 together by the non-flagellate end (Fig. 20, E and F). In this type 

 of division, it may be noted, the kinetonucleus comes to lie alongside 

 the trophonucleus, or even passes to the other side of it (i.e. nearer 

 the flagellar end). This method of division forms, as it were, a 



1 Swingle (81) lias recently found that T. lewisi may also divide by equal binary 

 fission ; and in such cases the two flagella may lie on opposite sides of the body. 



15 



