379] STUDIES ON MYXOSPORJDIA—KUDO 141 



Habitat: Opercle, pseudobranchiae and kidney of Leuciscus rutilus; 

 branchiae of Scardinius erythrophthalmus, Blicca bjorkna L., Gohio gobio 

 L., Abramis vlmba L., A. brama L., Rhodeus antarus Bl., Alburnus albtirnus 

 L., Lota lota L.; France (Isere), Germany (Pregel, Frisches and Kurisches 

 Haff, Masurische See, January, May). 



Vegetative form: Wegener observed cysts as follows. A type: 1 to 

 2mm. by 0.4 to 0.7mm. Form exactly like that of Myxobolus oviformis. 

 B type: small and round, present in groups. C type: small 0.5mm. by 

 0.2mm. 



Spore: Gurley gave the following short diagnosis from the observations 

 of J. Miiller: subcircular-ovate or broadly rounded elliptic, length 12m. 



Cepede distinguishes three different types of spores as follows: Lenticu- 

 lar in side view; subcircular (13.5^ by 13m), oval (14.7m by 11.4m) and 

 ovoidal (16m by 11m) in front view. Two polar capsules of equal size (6m 

 by 4m), closely set or separated {Six apart) from each other. Coiled polar 

 filament distinct. A small triangular intercapsular appendix. Sporoplasm 

 refractive and finely granular. Sutural edge exhibits folds of variable 

 number at the posterior portion. Dimensions of fixed and mounted 

 spores: length 10.5 to 12m, breadth 7.5 to 8m. 



Wegener, without noticing Cepede's paper, also mentions three different 

 types chiefly distinguished by the spore as follows: 



A type (common form), in the branchiae of Lota lota, Abramis brama, 

 A. vimba, Blicca bjorkna, Leuciscus rutilus, Alburnus alburnus and scardi- 

 nius erythrophthalmus . Cysts mentioned above. 



Spore. Rounded or oval; flattened. A tail, 15m long, was noticed 

 twice. A triangular intercapsular appendix. Sutural edge usually having 

 folds. Polar capsules often differ in form and size in different cysts, tho 

 they are constant in one and the same cyst, causing the variability in size 

 of sporoplasm. Dimensions: length 11 to 12.5m, breadth 8 to 9m, polar 

 capsule 4.5 to 6m by 3 to 3.7m, in many cysts 7.5m by 4m. 



B type. In the fifth gillarch of Gobio gobio L. Cysts mentioned above. 



Spore. Elongated oval. A triangular intercapsular appendix. Indis- 

 tinct folds on sutural edge. Dimensions: length 12.5 to 13.5m, breadth 8 

 to 10m, polar capsule 5 to 6m by 3 to 4m. 



C type. In the branchiae of Rhodeus amarus Bl,. and Alburnus alburnus 

 L. (April and May). Cysts mentioned above. 



Spore. Rounded. Distinct intercapsular appendix. Folds distinct 

 on sutural edge. Dimensions: length 12 to 15m, breadth 9 to 10m, polar 

 capsule 5 to 7m by 3 to 4m. 



MYXOBOLUS SPHAERALIS Gurley 



1874 Claparede 1874 : 113-114 



1893 Myxobolus sphaeralis Gurley 1893 : 415 



1894 Myxobolus sphaeralis Gurley 1894 : 240 



