160 ILLINOIS BIOLOGICAL MONOGRAPHS (398 



Wegener writes as follows: The white cysts are elongated, 1.2 to 1.8mm. 

 long and 0.5 to 0.7mm. wide. 



Spore: Cohn mentions dimensions exactly the same as those of 

 Henneguya psorospertnica and can not distinguish the two species by the 

 spore. 



Wegener gives the following dimensions: length 30 to 40/i, breadth 

 7 to 8m, length of the cavity of spore 15 to 18/i, length of tail 15 to 25^, 

 polar capsule 8/t by 2 to 3jn. 



HENNEGUYA MINUTA (Cohn) Labbe 



[Figs. 488 and 489] 



1895 Myxobolus minutus Cohn 1895 : 39-40 



1899 Henneguya psorospertnica 



minuia Labb€ 1899 : 102 



Habitat: Branchiae of Percafluviatilis L.; Frisches Haflf, Lesina. 



Vegetative form: Cohn's description is as follows: Cysts oval and 

 small, difficult to distinguish them from those of Henneguya psorospermica. 

 Size, 130/1 by 115/x. The parasite was met only once. But the number of 

 the cysts was far greater than that of Henneguya psorospertnica, often 5 to 6 

 on one lamella, reaching up to 200 cysts on a single gillarch. 



Spore: Cohn gives the following dimensions: total length (28 to 45)u) 

 about 36/i, length from the tip to the end of cavity (20 to 28m) about 26m, 

 breadth 10 to 11m, thickness 8m, polar capsule 11 to 14m by 2 to Zn, length 

 of polar filament 42 to 45m, length of tail (8 to 17m) 12m. Cohn gives a 

 figure (Fig. 489) of a spore with two vacuoles(?). 



HENNEGUYA OVIPERDA (Cohn) Labbe 

 [Figs. 490 and 491] 

 1892 Weltner 1892 : 28-36 



1895 Myxobolus oviperdus Cohn 1895 : 40-41 



1899 Henneguya psorospertnica ovi- 



perda Labbfi 1899 : 102 



1904 Hentieguya ^psorospertnica ovi- 



perda Fuhnnann 1904:469-471 



19 1 1 Henneguya psorospertnica ovi- 



perda Auerbach 1911 : 5-22 



1911 Henneguya psorospertnica ovi- 



perda Nemeczek 1911 : 146 



Habitat: Ovary of Esox lucius L.; Switzerland, Berlin, Frisches Haff 

 (all the year round), Upsala (May), Austria (December). 



Vegetative form: Cohn writes as follows: No real cyst exists. The 

 parasite occupies the ovum. 



Auerbach, however, mentions the presence of cysts in the connective 

 tissue and follicle epithelium of the ovary. Dimensions, 1mm. up to 5 or 

 6mm. in diameter. 



