150 ILLINOIS BIOLOGICAL MONOGRAPHS [388 



Vegetative form: Cysts, ovoidal or spindle form, 1 to 3mm. long and 

 1 to 1.5mm. wide. Body white. An extraordinary large number of spores 

 were found in the cysts. Polysporous. 



Spore: Round or slightly oval, when viewed from the front. Greatly 

 flattened in side view. Polar capsules convergent, with no intercapsular 

 body. Shell smooth. Sutural edge narrow, without folds. Dimensions: 

 length 10/i, breadth 9.8/i, thickness 3/^, polar capsules 3.8 to 5ju long, length 

 of polar filament 40/i. 



MYXOBOLUS MINUTUS Nemeczek 

 [Fig. 468] 



1911 Myxobolus minutus Nemeczek 1911 : 160 

 Habitat: Branchiae of Xewcwcw^ sp.; Austria. 



Vegetative form: Cysts spherical, oval or elongated with white color. 

 Size: 0.5 to 3mm. by 0.5 to 1mm. Polysporous. 



Spore: Rounded oval, similar to that of Myxobolus rotundus. Shell 

 smooth. Sutural edge narrow without folds. Sporoplasm with an iodino- 

 philous vacuole. No intercapsular appendix. Dimensions: length 6)u, 

 breadth 4.2 to 5/z, polar capsule 3/i by 2n, length of polar filament 50 to 60, 

 often lOjjL. 



MYXOBOLUS sp. Lebzelter 



1912 Myxobolus sp. Lebzelter 1912 : 296-297 

 Habitat: Gall-bladder of Thymallus thymallus L. 

 Vegetative form: Not observed. 



Spore: Sutural ridge distinct. Dimensions, length 5/x, breadth 3/i. 



MYXOBOLUS MAGNUS Awerinzew 

 [Figs. 469 and 470] 



1913 Myxobolus magnus Awerinzew 1913 : 75-76 

 Habitat: Eye of Acerina cernua L.; Petrograd. 



Vegetative form: Trophozoites form white spots in the tissue of iris, 

 with many spores (300 to 400). Each pansporoblast forms in most cases 

 two, sometimes 3 or 5 spores! Polysporous. 



Spores: Large, elongated roundish, slightly flattened. Sutural edge 

 somewhat thick, forming a wide ridge, with 4 to 5 folds at the posterior 

 portion. Polar capsules do not cross each other. Sporoplasm with an 

 iodinophilous vacuole and two nuclei. Dimensions: length 38 to 45ju, 

 breadth 32 to 38/i, thickness 28 to 35m, length of polar capsules 15 to 17^, 

 diameter of the vacuole 12 to 16^. 



MYXOBOLUS CARASSII Klokacewa 

 [Figs. 471 to 473] 



1914 Myxobolus carassii Klokacewa 1914 : 182-184 

 Habitat: Body cavity, liver and intestine of Carassius vulgaris L ; 



Petrograd? 



