351] STUDIES ON MYXOSPORIDJA—KUDO 113 



Vegetative form: The largest trophozoite 160^ by 21 fi. No distinction 

 between ectoplasm and endoplasm could be drawn, except in a few indi- 

 viduals in which there was a cyst- wall. Spores are formed in pairs. Proto- 

 plasm with two kinds of nuclei, some vesicular, others smaller and com- 

 pact. Polysporous. 



Spore: Fusiform with rather pointed ends. Shell finely striated. Two 

 comparatively small polar capsules, one at each end. Sporoplasm with 

 one or two nuclei, contains, often, two large vacuoles. Dimensions: 

 length 16/x (a few 11 ix), breadth 5^ (many broader than this). 



Remarks: The discoverer, J. P. Mackie mentioned that the parasites 

 did not appear to excite any reaction in the tissue of the host, the animal's 

 health being unaffected. 



MYXIDIUM MACROCAPSULARE Auerbach 

 [Figs. 272 and 273] 



1910 Myxidium macrocapsulare Auerbach 1910 : 440-441 



Habitat: Gall-bladder of Scardinius eryihrophihalmus L.; Karlsruhe. 



Vegetative form: Not observed. 



Spore : Elongated elliptical when viewed at right angles to sutural plane. 

 Shell somewhat thick with longitudinal striations parallel to the sutural 

 line. In side-view, both ends pointed in diagonally opposite directions. 

 Polar capsules are comparatively large, one at each end, opening at the 

 sharply pointed end. Dimensions: length 10 to 12/x, breadth 6/x, polar 

 capsules 3 to 4^t. 



Remarks: No pathological change. Bile was clear. 



Habitat: Gall-bladder of Cottus scorpius; Aleksandrowsk, North Sea. 



Vegetative form: Trophozoites are small. The protoplasm is differ- 

 entiated into ectoplasm and endoplasm in some specimens. Very active 

 formation of filiform pseudopodia of various length. Degenerating troph- 

 ozoites, with one or two empty spaces are often noticed. Each spore 

 is formed independently from each other. Monosporous, disporous and 

 polysporous (with three spores). 



Spore: Form similar to Myxidium incurvatum. Young spores not 

 curved. Dimensions: length 20 to 35^1, breadth 10 to 15/i. 



