130 ILLINOIS BIOLOGICAL MONOGRAPHS ■ [368 



Spore: Form similar to Myxosoma dujardini. A single polar capsule 

 at the anterior end, obliquely directed. Dimensions: length 0.0051'", 

 breadth 0.0034'". 



MYXOBOLUS FUHRMANNI Auerbach 

 [Fig. 367] 



1909 Myxoholus fuhrmanni Auerbach 1909 : 65-68 



1910 Myxoboliis fuhrmanni Auerbach 1910c : 178-179 



Habitat: Connective tissue under the mucous membrane of the mouth 

 of Leuciscus rutilus L.; Neuchatel Lake. 



Vegetative form: Cysts, of pea-size, surrounded by several membra- 

 nous layers of connective tissue with a few nuclei. Finely granular ecto- 

 plasm forms outer layer. Endoplasm is dense and contains faintly stained 

 nuclei. Pansporoblasts and spores are found in the central portion of the 

 cyst. Polysporous. 



Spore: Elongated pyriform, with attenuated anterior and rounded 

 posterior ends. Majority with a single polar capsule; spores with two 

 polar capsules were also observed. Shell thick, at the posterior end. 4 to 

 6 notch-like markings on the posterior part of the shell. Sutural ridge 

 thickened and fairly well marked. Coiled polar filament visible in pre- 

 served material. The opening of the polar capsule is either at the anterior 

 end or near it. Sporoplasm with two nuclei of unequal size and a com- 

 paratively large iodinophilous vacuole, stained brown with iodine alcohol. 

 Dimensions: length 18 to 20/x, breadth about 8/z, thickness 6/i, length of 

 polar capsule 9 to lOju. 



MYXOBOLUS OCULLLEUCISCI Trojan 

 [Fig. 368] 



1909 Myxobolus oculi-leucisci Trojan 1909 : 679-682 



Habitat: Vitreous body of the eye of Leuciscus rutilus L.; Prague 

 (May?). 



Vegetative form: Two cysts, spherical and subspherical, 100 to 180/i in 

 diameter. Ectoplasm finely granular. Outer portion of endoplasm with 

 small nuclei, then larger nuclei each surrounded by protoplasm, while the 

 central portion contains spores. Polysporous. 



Spore: Elongated oval, flattened dorso-ventrally. Posterior margin 

 rounded. At the anterior end, a single polar capsule with distinctly visible 

 coiled polar filament. Shell smooth without any markings. Sporoplasm 

 with one nucleus, usually elongated oval (2.8)u in diameter) and one 

 vacuole, occupies more than half of the space of the spore. Dimen- 

 sions: length 9 to 10/x, breadth 4.5 to 5.5m, thickness 3/^, polar capsule 

 Six by 2 p.. 



