190 



SEX IN MICROORGANISMS 



1906) or "heads" in opposite directions as in Lecyth'mni thalassemae 

 (52; Adackinnon and Ray, 1931). 



When mature, each pair rounds up and becomes encysted (Fig. 

 S, 9). In this gametocyst each gamont produces a relatively large 

 number of gametes after a series of nuclear divisions. In anisogamy 

 the uniting gametes are from the different parents, and it is assumed 

 that the same is true in isogamy. Each zygote secretes a sporocyst 

 or oocyst membrane within which eight sporozoites are commonly 

 formed. 



Both pregametic and postzygotic meiosis have been recorded for 



TABLE III 



Meiosis in Eugregarines 

 (Sequences in each group are chronological.) 



