334 RESEARCH IX PROTOZOOLOGY 



is composed of two parts, a proximal solid portion and the distal 

 portion, occupies a large portion of the intrasporal cavity, while 

 a small rounded sporoplasm is present at the posterior end. An 

 exactly same structure was recognized in Mrazekia piscicola 

 (Cepede, 1924), M. niphargi and Toxogliigca mcrcieri (Poisson, 



1928). 



(2) The sporoplasm is present near the middle part of the 

 spore in a girdle-form, and the polar filament is coiled in the pos- 

 terior space of the spore and connected with the anterior end 

 through the sporoplasm ring. In the spore of Plistophora loiigifilis 

 Schuberg (1910) observed that there was a girdle-Hke sporoplasm 

 a little toward the anterior end and that the polar filament was 

 coiled directly under the spore membrane mostly in the posterior 

 portion of the intrasporal cavity. A similar structure was recog- 

 nized in the spores of Nosema apis (Fantham and Porter; Trapp- 

 mann), A', boiiibi fFantham and Porter), Gliigea anomala, G. 

 hertungi (Weissenberg), Xoscnia hryo2oides, N. glossipJionice 

 (Schroder), .V. bonibycis (Omori), Plistophora blochnmnni 

 (Zwolfer, 1926), and Thelohania ephesticE (Mattes, 1928). 



Thus one finds contradictory views on the structure of even one 

 and the same species of microsporidia. For examples, note the 

 views of various authors on Xoscma bonibycis, N. apis and Plis- 

 tophora (Gliigea) danilczi'skyi. 



Judging from the observations made on comparatively large 

 spores, it seems safe to state that there are at least four types 

 of microsporidian spores with regard to their structure. They 

 are: 



(i) Spore ovoidal, one polar capsule at each end. The sporo- 

 plasm in band- form between the capsules. Example : Telomyxa 

 glugeiformis after Leger and Hesse (1910). 



(2) Spore cylindrical; no polar capsule; polar filament com- 

 posed of basal rod-like part and the filament, occupying the greater 

 part of the spore ; the sporoplasm at the opposite end. Example : 

 Mrazekia argoisi after Leger and Hesse (1916). 



(3) Spore pyriform; polar capsule present occupying anterior 

 half or two-thirds of the intrasporal cavity; the sporoplasm at the 

 posterior end. Examples : Plistophora macrospora after Leger and 

 Hesse (1916a) ; Stempcllia magna after Kudo (1921, 1924). 



(4) Spore ovoidal ; no polar capsule ; the polar filament is coiled 

 in the posterior cavity of the spore; the sporoplasm in girdle-like 



