Figure 142. Actinophrys sol in autogamous fertilization. A, progamous division of 

 original gamont; B, the two daughters of this division within a common envelope, their 

 nuclei showing looping chromatin threads; C, pairing and twisting of thread-like chromo- 

 somes (left), and shortening and thickening of chromosomes (right) ; D, first matura- 

 tion (reduction) division, with bivalent chromosomes on the equatorial plate (left), 

 and disjunction and separation of homologous chromosomes (right) ; E, second matura- 

 tion (equational) division, with first "polar bodies" below; F, pseudopodium of $ 

 gamete making contact with $ gamete ; G, fusion of cell bodies ; H, fusion of nuclei to 

 form zygote. (After Belar, 1923. D is a composite.) 



