REPRODUCTION 



139 



becomes the center of a new individual. The number of daughter 

 individuals often varies, not only among the different species, 

 but also within one and the same species. Multiple division occurs 

 commonly in the Foraminifera (Fig. 157), the Radiolaria (Fig. 

 167), a few Mastigophora such as Trypanosoma lewisi (Fig. 112), 

 T. cruzi, and many Hypermastigina. It is very common among 

 various groups of Sporozoa in which the trophozoite multiplies 

 abundantly by this method. 



Fig. 64. Nuclear and cytosomic division in Menoidium incurvum, 

 X about 1400 (Hall), a, resting stage; b, c, prophase; d, equatorial 

 plate; e, f, anaphase; g, telophase. 



Budding. Multiplication by budding which occurs in the Proto- 

 zoa is the formation of one or more smaller individuals from the 

 parent organism. It is either exogenous or endogenous, depend- 

 ing upon the location of the developing buds or gemmules. 

 Exogenous budding has been reported in Acanthocystis, Nocti- 

 luca (Fig. 101), Myxosporidia (Fig. 65, h), astomous ciliates 

 (Fig. 228), Chonotricha, Suctoria (Fig. 289, k), etc. Endogenous 

 budding has been found in Testacea, Gregarinida, Myxosporidia 

 (Figs. 212, e; 214, j), and other Sporozoa as well as Suctoria 

 (Fig. 289, h). Collin observed a unique budding in Tokophrya 



