CNIDOSPORIDIA, MYXOSPORIDIA, ACTINOMYXIDIA 315 



Triactinomyxon mrazeki Mackinnon and Adam. With 50 

 sporoplasms. All in Tubifex tubifex, occurring in various parts of 

 Europe. 



Triactinomyxon magnum Granata. Each spore with 16 

 sporoplasms. In Limnodrilus udekemianus . 



Genus Sphaeractinomyxon Caullery and Mesnil. Parasitic 

 in the coelom of oligochaetes. The spore is rounded and without 

 any processes. In the early stage of development, there are two 

 uninucleate bodies surrounded by a binucleate envelope. The 

 two inner cells multiply into 16 cells which unite in pairs. The 

 nucleus of the zygote or sporont divides first into two. One of 

 the nuclei divides into six nuclei which form three valves of the 

 spore membrane and three polar capsules, while the other nuc- 

 leus together with a portion of the cytoplasm remains outside 

 the envelope, and undergoes multiplication. Later the multi- 

 nucleate sporoplasm migrates into the spore. The sporoplasm 

 later divides into a large number of uninucleate sporoplasms 

 which, when the spore enters a new host, begin development. 



Sphaeractinomyxon stolci Caullery and Mesnil (Fig. 134, b). 

 The spore is spherical. Parasitic in Clitellis arenarius and Hemi- 

 tubifex benedii. 



Sphaeractinomyxon gigas Granata (Fig. 134, c). In the body 

 cavity of Limnodrilus hoffmeisteri. 



Genus Hexactinomyxon Stole. Each of the three shell-valves 

 is prolonged into two processes. Thus the spore appears as a 

 six-armed anchor. 



Hexactinomyxon psammoryctis Stole (Fig. 134, e). In the 

 gut-epithelium of Psammoryctes barbatus. The sporoplasm is 

 multinucleate. 



Genus Synactinomyxon Stole. The spore with two prolonged 

 shell-valves and one conical valve. 



Synactinomyxon tubificis Stole (Fig. 134, /, g). Parasitic in 

 the gut-epithelium of Tubifex tubifex. 



Genus Neoactinomyxum Granata. The three shell-valves 

 without any process, but distended to hemi-sphere. 



Neoactinomyxum globosum Granata (Fig. 134, h). Numerous 

 sporoplasms. In the gut-epithelium of Limnodrilus udeke- 

 mianus. 



