102 ILLINOIS BIOLOGICAL MONOGRAPHS [340 



SPHAEROSPORA PLATESSAE Woodcock 

 [Figs. 193 and 194] 

 1904 Sphaerospora platessae Woodcock 1904 : 59-60 



Habitat: Otic-capsule of Pletironectes platessa L.; England. 



Vegetative form: Cysts opaque masses about 1mm. in diameter. 

 The cartilage was greatly hypertrophied. Polysporous (presumably). 



Spore: Spherical. Shell unornamented. Two polar capsules. Sporo- 

 plasm with several refractive granules, but without any vacuole. Dimen- 

 sions: diameter 8 to 9n, length of polar filament about 70/x. 



Remarks: Woodcock placed this species provisionally in the genus 

 as he could not examine any fresh material, but had studied smears only. 



SPHAEROSPORA ANGULATA Fujita 



[Figs. 195 to 197] 



1912 Sphaerospora angulata Fujita 1912 : 261-262 



Habitat: Kidney of Cyprinus carpio L., Carassius auratus L.; Sapporo 

 (Nippon). 



Vegetative form: Only description: "The number of the spore in the 

 sporoblast is in this case always less than in the others, rarely exceeding 

 two." ^ 



Spore: Somewhat triangular, with convex sides, oval in sideview. 

 Slightly pointed at the mid-posterior margin of the spore. Shell very thin, 

 faintly marked with concentric striations. Two oblong polar capsules 

 are of unequal size. Dimensions: length 7 to 8fx, breadth 6 to 7ju, thickness 

 5m, length of largest polar capsule 3.8^, length of polar filament twice as 

 long as that of the spore. 



SPHAEROSPORA POLYMORPHA Davis 



[Figs. 198 and 199] 



1917 Sphaerospora polymorpha Davis 1917 : 231-232 



Habitat: Urinary bladder of Opsanus tan; Beaufort (June, July). 



Vegetative form: Elongate, but never very irregular in shape. Slowly 

 ameboid. Body colorless. Ectoplasm clearly seen in younger forms, 

 forming one to several large lobate pseudopodia, which in turn extrude 

 several short, conical pseudopodia. In larger forms, ectoplasm is, often, 

 recognizable only at ends of pseudopodia, which in such cases are composed 

 chiefly of endoplasm. Endoplasm granular, vacuolated in some smaller 

 forms, but in larger individuals vacuoles are indistinct or absent; small fat 

 globules abundant in large forms; numbers of rounded sporoblast cells 

 can be distinctly seen. Size of large trophozoites 35^ by 50ju. Disporous 

 and polysporous (polysporous forms rarely contain many spores at the 

 same time). 



