136 ILLINOIS BIOLOGICAL MONOGRAPHS [374 



Size 3.5mm. by 0.8mm. Cysts are surrounded by thick layers (7 to 8ju) of 

 the connective tissue of the host. Ectoplasm seems to be undifferentiated. 

 Endoplasm granular, contains a larger number of spores. Polysporous. 



Spore: Thelohan's diagnosis is as follows: 



Ellipsoidal or slightly oval. Shell with 3 to 5 folds along sutural edge. 

 Polar capsules of unequal size, with a small intercapsular body. The 

 vacuole is difficult to stain with iodine. Dimensions: length 10 to 

 12yn, breadth S^i, polar capsule 7/i by 5/i. 



Wegener's form is as follows: length 11 to \.2n, breadth 7,5 to 8^, 

 larger polar capsule 6 to 7jli by 3.5/x, smaller one 4^ by 2.5 to 3/i. The 

 sporoplasm is shifted toward the smaller polar capsule. 



MYXOBOLUS ELLIPSOIDES Thelohan 



[Figs. 387 to 389] 



1852 

 1892 

 1895 

 1898 

 1905 

 1910 

 1912 



Habitat: Connective tissue of air bladder, branchiae, kidney, spleen, 

 liver and cornea of Tinea tinea L., branchiae of Abramis brama L., Alburnus 

 lucidus Heck., Leuciseus rutilus L., Squalius cephalus L., Abramis vimpa 

 Cuv., Blicea bjorkna L., Idus melanotus; France, Vierwaldstatter See, 

 Prague, Masurische See, Italy. 



Vegetative form: Thelohan does not describe. 



According to Wegener, white cysts, elongated oval; 2mm. by 0,5mm. 

 , in size. Polysporous. 



Spore: Thelohan described as follows: Flattened elliptical, rather 

 elongated. Sutural edge broad without any folds. Shell with no marking. 

 Form of the spore somewhat variable. Two polar capsules of equal size, 

 capsulogeneous nuclei present even when fully grown. Abnormal spores 

 are of frequent occurrence. Dimensions: length 12 to 14/x, breadth 9 to 

 ll^t, length of polar capsule 4ju. 



Wegener's form: length 14 to 15ju, breadth 10 to ll^t, polar capsule 

 4 to 5n by 3/i. Shell comparatively thick. One spore had a tail S/jl long. 



MYXOBOLUS EXIGUUS Thelohan 



[Figs. 390 to 395] 



1891 Myxosporidium mugilis ? Perugia 1891 : 23 



1895 Myxobolus exiguus Thelohan 1895 : 349-350 



1906 Myxobolus exiguus Schroder 1906 : 195 



1910 Myxobolus exiguus Wegener 1910 : 75 



1912 Myxobolus exiguus Parisi 1912 : 294-295 



