146 ILLINOIS BIOLOGICAL MONOGRAPHS [384 



MYXOBOLUS SCARDINII Reuss 

 [Fig. 449] 

 1906 Myxobolus scardinii Reuss 1906 : 201 



Habitat: Branchiae of Scardinius erythrophthalmus L. ; Volga. 

 Vegetative form: Cysts, elongated oval. Smaller cysts rounded oval, 

 0.8mm. by 0.5mm., the larger forms elongated, 1.2mm. by 0.5mm. Poly- 

 sporous. 



Spore: Broad elliptical. Sutural edge narrow, having folds. A larger 

 triangular intercapsular process. An iodinophilous vacuole in sporoplasm. 

 Dimensions: length 11 to i2fi, breadth 9 to 9.5ju, thickness 4.5 to 5^, 

 polar capsules 5n by 2.5/i. 



MYXOBOLUS PHYSOPHILUS Reuss 

 [Figs. 450 and 451] 

 1906 Myxobolus physophilus Reuss 1906 : 201-202 



Habitat: Surface of air bladder of Scardinius erythrophthalmus L.; 

 Volga. 



Vegetative form: Cysts, rounded, 1.5mm. in diameter. Polysporous. 



Spore: Oval, with attenuated anterior end. Sutural edge narrow 



and smooth. Polar capsules rather large. An iodinophilous vacuole in 



sporoplasm. Dimensions: length 12 to 13/i, breadth 8.25 to 9/i, thickness 



6.5 to 7/i, polar capsules 6/i by 2.5/*. 



MYXOBOLUS MACROCAPSULARIS Reuss 

 [Fig. 452] 

 1906 Myxobolus macrocapsularis Reuss 1906 : 202 



Habitat: Branchiae of Blicca bjorkna L.; Volga. 



Vegetative form: Cysts, Elongated oval. Size: 1mm. by 0.5mm. 

 Polysporous. 



Spore: Oval with greatly attenuated anterior portion. Sutural edge 

 broad and without any fold. Polar capsules rather large. An iodinophil- 

 ous vacuole in sporoplasm. Dimensions: length 11 to 13;*, breadth 8.25 to 

 9.25/*, thickness 5.5/*, polar capsules 6/* by 2.5 to 3/i. 



MYXOBOLUS SANDRAE Reuss 



[Fig. 453] 



1906 Myxobolus sandrae Reuss 1906 : 202-203 



Habitat: Muscle of Luciop&rca sandra Cuv.; Volga. 



Vegetative form: Cysts. Rounded, 0.5mm. in diameter. Polyspor- 

 ous. 



Spore: Oval. Sutural edge broad with many distinct folds. An 

 iodinophilous vacuole in sporoplasm. Dimensions: length 9.25 to 10/*, 

 breadth 7.25 to 8.25/*, thickness 4 to 5/*, polar capsules 3.5/i by 2/*. 



