88 OUTLINES OF EVOLUTIONARY BIOLOGY 



FIG. 38. Life History of Bodo, or the Springing Monad, very highly 

 magnified. (From Dallinger and Drysdale.) 



A. Ordinary individual. 



B., C. Multiplication by longitudinal fission (the nucleus divides and the cell body aiid 



both flagella split lengthwise). 

 D F. Multiplication by transverse fission (the nucleus and cell body divide, the trailing 



flagellum splits lengthwise and a new anterior flagellum is budded out at one end). 

 G. Two gametes about to conjugate. 

 H. Conjugation. 



J. Zygote formed by conjugation, with flagella still attached. 

 K. Fully formed zygote. 



L. Escape of spores by rupture of the zygote wall. 

 M. Development of the spores. 

 a./., anterior flagellum; a'./., new anterior flagellum sprouting out; nu., nucleus; 



sp., spores ; t.f., trailing flagellum ; zyg.nu., zygote nucleus. 



