MICROSPORIDIA 335 



form near the middle of the spore, through which the filament 

 reaches the anterior end. Example : PlisfopJwra longifilis after 

 Schuberg (1910). 



It is interesting to note here again, as the writer has done before, 

 that the structural variation in microsporidian spores seems to be 

 delimited by myxosporidia on one hand and haplosporidia on the 

 other. In genera Coccoiuyxa, Unicapsiila and Myxobolus (uni- 

 capsulated), one finds a pyriform polar capsule at one end and a 

 sporoplasm at the other, which is exactly similar to the spores of 

 PlisfopJwra nwcrospora or StempclUa magna. In Telomyxa glugei- 

 formis, the only bicapsular microsporidian, one finds a close struc- 

 tural similarity between it and myxosporidian spores belonging to 

 genera Myxidium or Zschokkella. On the other hand, forms such 

 as Ocfosporca musccc-domesticcc or O. monospora seem to show 

 somewhat close affinity to haplosporidia. 



2) The nucleus of the sporoplasm. As to the number of the 

 nuclei present in the sporoplasm of presumably mature spores, 

 observations vary even in one and the same species according to 

 dififerent observers. 



A single nucleus was noted in Xosenm bombycis (Omori), A^. 

 apis (Kudo), A^ ctenocephali (Korke), A^. bcetis, N. cyclopis, N. 

 anophelis, TJielohaniu obesa, T. pyrifonnis (Kudo), T. varians 

 (Debaisieux), T. corethrce (Schuberg and Rodriguez), T. vandeli 

 (Poisson, 1924). PlisfopJwra longifilis (Schuberg). 



One or two nuclei were noted in the spores of Xoseina bombycis 

 (Leger and Hesse), Thelohania acuta f (Schroder), T. legeri 

 (Kudo). Toxoglugea mercieri (Poisson, 1924) and PlisfopJiora 

 blochmanni (^Zwolfer, 1926). 



Two nuclei were noticed in Xosema bombycis (Kudo), A^. 

 bryozoides (Schroder), A', mariofiis ( George vitch). A', apis (Fan- 

 tham and Porter, Classen, Trappmann), A', bombi (Fantham and 

 Porter), A', glossiphonice (Schroder), A', frenzclince (Leger and 

 Duboscq). A', binucleatum (Weissenberg. 1926), A^ nepce (Pois- 

 son, 1928), A\ nonagricc (Schwarz, 1929), Pere::ia mesnili, P. 

 legeri (Paillot), Glugca stephani (Woodcock), PlisfopJwra 

 (Glugea) danilewsJ^yi (Guyenot and Xaville), TJielohaniu ephestice 

 (Mattes, 1928), PlistopJwra macrospora (Leger and Hesse), 

 MraceJ^ia argoisi, M. brez'ieauda, M. caudata (Leger and Hesse;, 

 M. mraceJ?i (Hesse). M. piseicola (Cepede, 1924), .1/. nipJiargi 

 (Poisson. 1924), Octosporea musccc-domesficcc (Chatton and 



