383] STUDIES ON MYXOSPORJDJA—KUDO 145 



Spore: Elliptical in front view. Two polar capsules convergent. No 

 intercapsular appendix. Sutural edge rather thick with a number of folds 

 on the posterior margin. Sporoplasm with two nuclei and an iodinophilous 

 vacuole. Dimensions: length 10.8 to 11.7/i, breadth 9.9 to 10.4ju, thick- 

 ness 7.2 to 9n, length of polar capsule 4.5 to 5/x. 



Woodcock's form has a spore with the following characters: 

 Slightly ovoid. Sporoplasm always contains a large and well defined 

 vacuole and two nuclei. Dimensions: length lO/x, breadth 8m, length of 

 polar capsule 3.25 to 3.5ju. 



MYXOBOLUS GIGAS Auerbach 

 [Figs. 442 to 445] 



1906 Myxoholus gigas Auerbach 1906 : 386-391 



1910 Myxobolus gigas Auerbach 1910c : 182 



1912 Myxoholus gigas Parisi 1912 : 293-294 



Habitat: Subcutaneous connective tissue of the operculum of Abramis 

 hrama L.; Karlsruhe, Pavia. Parisi observed cysts on the side, on the 

 caudal fin (5 cysts on rays), on other fins, branchiae and in the internal 

 organs of the fish. 



Vegetative form: Cysts, spherical or ovoidal. No cyst membrane 

 composed of the connective tissue of the host. Protoplasm is indistinctly 

 differentiated. Ectoplasm thin and radially striated, which gradually 

 turns into endoplasm. Endoplasm finely granular, contains numerous 

 nuclei (2.5 to 2.7/i in diameter). Size of greatest form 360ju by 290 to 300/i. 

 According to Parisi size up to 1.5mm. 



Spore : Elliptical when viewed from the front. Sutural edge somewhat 

 narrow, having a number of folds at the posterior portion. Sporoplasm 

 with an iodinophilous vacuole and two nuclei. Dimensions: length 16.9 to 

 21.6m, breadth 13 to 16. 2^ thickness 9ju, length of polar capsules 7.8/i, 

 length of polar filament 90m (sulphuric acid) . 



Parisi gives 150m for the length of polar filament. 



MYXOBOLUS VOLGENSIS Reuss 



[Figs. 446 to 448] 



1906 Myxoholus volgensis Reuss 1906 : 200-201 



Habitat: Branchiae, cornea and dorsal fin of Lucioperca volgensis 

 Pall; Volga. 



Vegetative form: Cysts, spherical, 0.3 to 1mm. in diameter. Poly- 

 sporous. 



Spore: Broad elliptic or rounded. Sutural edge has at least 3 folds. 

 Sporoplasm with an iodinophilous vacuole. Dimensions: length 8.25 to 

 9.5m, breadth 7.25 to 8.25m, thickness 4.5 to 5.5m, polar capsule Sp, by Ipi. 



