339] STUDIES ON MYXOSPORIDIA—KUDO 101 



Spore: Spherical, somewhat attenuated at the anterior end. Sutural 

 ridge present, terminating in a small projection at each end of the spore. 

 Two polar capsules spherical. Coiled polar filament not visible in fresh 

 state. Dimensions: diameter lO^t in average, sutural diameter about ll^i. 



SPHAEROSPORA ROSTRATA Thelohan 

 [Fig. 189] 

 1895 Sphaerospora rostrata TWlohan 1895 : 339 



Habitat: Malpighian bodies of kidney of Mugil sp.; Roscoff, Le 

 Croisic, Le Vivier-sur-mer, Marseille, Banyuls. 

 Vegetative form: Not described. 



Sphore: Subspherical. Shell shows deep longitudinal striations which 

 end in sharp spinous edges at the posterior end. Sutural ridge well 

 marked. Anterior part shows enlargement of quadrangular lamella, which 

 is spinous in side view. Dimensions: 10 to 12/i in diameter, sutural 

 diameter 1 to 2/i longer, length of polar filament 40/z. 



Remarks: The parasites cause the degeneration of the Malpighian 

 bodies. 



SPHAEROSPORA MASOVICA Cohn 



[Figs. 190 to 192] 



1902 Sphaerospora tnasovka Cohn 1902 : 628-632 



Habitat: Gall-bladder of Abramis brama L.; Mauersee. 



Vegetative form: Polymorphous, due to active movements. Trans- 

 parent and colorless, while in motion. Endoplasm highly granular, contains 

 yellowish enclosures. Ectoplasm hyaline, forms a narrow layer around the 

 body, occasionally developing into a blunt lobose pseudopodium. Pseudo- 

 podia of two kinds; lobose and filose, also intermediate forms. Filiform 

 pseudopodia are formed and retracted more slowly than the lobose. 

 Plasmotomy is of probable occurrence. Two spores are formed in each 

 pansporoblast. Size variable: lOfj. (with no spore), 18/i (with sporob lasts), 

 29^ (with 4 sporoblasts), 38/i (with 22 sporoblasts). Disporous(?), poly- 

 sporous. 



Spore: Spherical. Sutural ridge well marked. Polar capsules and 

 sporoplasm are comparatively small, the former convergent. By warming 

 the spore, polar filament is extruded and at the same time two filaments 

 ("starren Faden") are made visible at the anterior part of the sutural plane. 

 Sporoplasm with two nuclei, no vacuole being present. Dimensions: 

 diameter 8/i, length of polar filament 38/f, length of sutural filament 14/i. 



Remarks: Cohn did not observe free spores in the gall-bladder. He, 

 however, saw many free spores, separated from each other, in the intestine, 

 concluding that the body and pansporoblast membrane of trophozoites, 

 are destroyed in the intestine, setting the spores free. 



