142 ILLINOIS BIOLOGICAL MONOGRAPHS [380 



Habitat: Mucosa of branchiae of Coregonus lavaretus L. (C. fera); 

 Lake Geneva. 



Vegetative form: Cysts, 0.25 to 0.33mm. in diameter. Polysporous. 

 Spore: Spherical, 9/z in diameter. 



MYXOBOLUS ANURUS Cohn 

 [Figs. 422 and 423] 



Habitat: Branchiae of Esox lucius L.; Konigsberg (March, December), 

 Frisches Haff, Pregel, Masurische See, Lotzen, (September, October). 



Vegetative form: Cysts small rounded and of white color. Cohn 

 measures length 0.6mm., breadth 0.34mm. Wegener's form: length 0.3 

 to 0.5mm. and breadth 0.2 to 0.3mm. 



Spore: Cohn's descriptions are as follows: More or less oval. Dimen- 

 sions: length 12 to 15/i, breadth 4 to 6.8/*, polar capsule 5.5 to 7/x by 2.1 to 

 2.5/i, length of polar filament 32 to 38m. 



Wegener's form : Elongated and narrow, often with a tail. Dimensions : 

 length 15/i (maximum up to 18^), breadth 6 to 7/*, polar capsule 8n by 3n. 



Remarks: Tho Labbe classified this as a subspecies of Henneguya pso- 

 rospermica Thelohan, Wegener's observation gives stronger basis for placing 

 this form in the genus Myxobolus. 



MYXOBOLUS sp. Gurley 

 [Fig. 424] 



1882 B&tschli 1882 : 590 



1894 Myxobolus sp. incert. Gurley 1894 : 214 



1899 Myxobolus sp. Labb6 1899 : 100 



Habitat: Nais lacustris L. {N. prohoscidea); Locality? 

 Vegetative form: Cysts, 8mm. by 4.25mm. Polysporous. 

 Spore: Oval or circular; tailed or untailed. These spores of diflrerent 

 form occur, often, without order in the same cyst. 



MYXOBOLUS sp. Gurley 

 [Fig. 425] 

 1894 Myxobolus sp. incert. Gurley 1894 : 239 



Habitat: Body cavity of Carassius carassius L.; Leipsic. 

 Vegetative form: Not observed. 



