162 ILLINOIS BIOLOGICAL MONOGRAPHS [400 



Vegetative form: Rounded or elongated. In larger individuals, clear 

 dinerentiation of protoplasm. Monosporous (?) and polysporous. 



Spore: Fusiform. Shell striated. A vacuole in sporoplasm. Dimen- 

 sions: length 20 to 24)U, breadth 5 to 6/i, polar capsules 4 to 5/i. Tail short. 



HENNEGUYA BREVIS Thelohan 



1854 Lieberkiilm 1854 : 357 



1892 Henneguya brevis Thelohan 1892 : 177 

 1895 Henneguya brevis Thelohan 1895 : 354 



Habitat: Similar to H. media Thelohan. 

 Vegetative form: Undescribed. 



Spore: Fusiform with short tail. Dimensions: length 14 to 15/x, 

 breadth 5 to 6^1, polar capsules 1.4 to 5ju, tail 4 to 5ju long. 



HENNEGUYA SCHIZURA (Gurley) Labbe 

 [Figs. 497 to 499] 



1841 MiiUer 1841 : 477-478 



1893 Myxobolm schizurus Gurley 1893:417 



1894 Myxobolus schizurus Gurley 1894 : 255 

 1899 Henneguya schizura Labb6 1899 : 102-103 



Habitat: In cellular tissue of the eye muscles, in that of the sclerotic, 

 and in that between the sclerotic and choroid of Esox lucius L.; Germany, 

 U. S. A. 



Vegetative form: Cysts white; membrane delicate; 0.44 to 1.09mm. in 

 diameter. 



Spore: Oval. Dimensions: length 12ju, breadth 6/i, thickness one- 

 half the breadth, tail 3 to 4 times length of the body. 



HENNEGUYA CREPLINI (Gurley) Labbe 



Habitat: Branchiae of Acerina cernua L.; Pregel (March), Frisches 

 and Kurisches Haff. 



Vegetative form: Wegener describes as follows: Cysts, usually elon- 

 gated oval and are located at the end of branchial lamella. Color white. 

 Size 1 to 1.1mm. by 0.5mm. During winter, the cyst has only pansporo- 

 blasts, but no fully grown spores. 



Spore: Creplin writes as follows : Elongated elliptical. Length 1/120'", 

 breadth 1/360'", tail about as long as or a little longer than the body. 



Wegener's form: elongated spindle shape; length 20)u, breadth 8 to 

 9jLi, polar capsule Sn by 2 to 3^1 (parallel to each other). 



