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 Myxobolus fuhrmanni Auerbach 1909 : 65-68 



1910 Myxobolus 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 20fx, breadth about 8fx, thickness 6fi, length of 

 polar capsule 9 to lO^t. 



MYXOBOLUS OCULI-LEUCISCI Trojan 

 [Fig. 368] 



1909 Myxoholus 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/i in diameter) and one 

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

 sions: length 9 to lOjit, breadth 4.5 to 5.5/i, thickness 3n, polar capsule 

 5ju by 2fi. 



