550 



BIOLOGY OF THE PROTOZOA 



capsules and similarly disappear and 2 remain as germinal nuclei. 

 It is generally assumed that these 2 nuclei are descendants of the 

 original dimorphic nuclei of the trophozoite and observations by 

 Schroder (1910), Davis (1916), Erdmann (1911 and 1917), Naville 



Fig. 220. — Leplotheca scissura, vegetative individuals with well-developed spherules. 



(After Davis.) 



(1931) leave little doubt that they ultimately fuse in autogamous 

 fertilization (p. 324). 



The spores which differ from sporoblasts of the Telosporidia in 

 that, they are not formed as a result of fertilization are the most 

 characteristic structures of the Myxosporidia and are much more 

 highly differentiated than are sporoblasts of the former group. They 



