MYXOSPORIDIASIS 



247 



The present authors have investigated species of 

 Myxidium (Fig. 45) from the gall-bladders of Gadus 

 pollachius, G. merlangus, Coitus bubalis, Raja batis, 

 R. maculata, and other fishes, and so far have rarely 

 seen continued or simultaneous plasmotomy. The 

 formation of buds appears to have been more isolated 



FIG. 45 MYXIDIUM FROM THE GALL - BLADDER OF GADUS 

 MERLANGUS (ALLIED TO THE COD) 



A, Trophozoite of Myxidium. ps., Pseudopodia; s., spore; y.s. t 



young spore 



B, A single spore of Myxidium stained, much enlarged. Polar 



capsules with filaments inside, two sporoplasmic nuclei, polar 

 capsule nuclei, and remains of valvular nuclei seen 



than in the case of the pike parasite. In the above 

 fishes the epithelium of the gall-bladder is often 

 directly attacked by the parasites, which sometimes 

 lie deep within it, but more often with their pseudo- 

 podia (Fig. 45, A, ps.) penetrating it for a consider- 

 able distance, and at times even reaching the 



