PARASITES OF PROTOZOA 



1049 



species of Devescovininae. There are very few observations on actual 

 nuclear division; Dangeard (1895) interpreted as this some figures he 

 observed, but did not see nuclear division in the larger nuclei of the 

 early stages. Niigler (1911b) reported dumb-bell-shaped figures, as well 

 as granular fragmentation stages, in the parasite of Euglena sanguinea. 

 The outcome, in any event, is in typical Sphaerita a multinucleate thallus, 

 which is converted entire into the sporangium. 



Parasites, which in some phases are much like Sphaerita but lack a 



Figure 217. A, various stages in development of Sphaerita in Devescovina sp. from 

 Neotermes tectonae; B, Sphaerita and other microorganisms in Entodiniurn sp. and 

 Eudiplodinium sp. from ruminants; C, mature sporangium of Sphaerita from Nyctotherus 

 ovalis ; D, developmental stages of Sphaerita and aggregations of bacteria in Nyctotherus 

 ovalis. (A, original; B, after Winogradowa, 1936; C, D, after Sassuchin, 1928a.) 



multinucleate structure, have been described, however. Mitchell (1928) 

 reported a parasite in Euglena caudata, which, after growing to a 

 relatively large uninucleate body, underwent repeated division of 

 both nucleus and cytoplasm to form spores. Ivanic (1925), describing 

 in free-living amoebae parasites which appear to be Sphaerka-Uke, stated 

 that the uninucleate forms grow and multiply by binary fission before 

 the plasmodial period begins. When, as is often true in preparations, the 

 cytoplasm of the parasite is not apparent, division of the nuclei may 

 be mistaken for division of individuals within a vacuole. Individual 



