323] STUDIES ON MYXOSPORIDIA—KUDO 85 



Remarks: Tho Fujita does not describe the vegetative form and there 

 are some differences in the form and size of the spore between the forms, 

 the writer does not find out any objection against the union of the above 

 mentioned two forms. 



f 



MITRASPORA CAUDATA (Parisi) Kudo 



[Figs. 105 to 107] 



Habitat: Renal tubules of kidney of Alosa finta Cuv. var. lacustris 

 Fatio; Lake Como. 



Vegetative form: Rounded or variously elongated owing to the move- 

 ments. Protoplasm is distinctly differentiated into ectoplasm and endo- 

 plasm. Ectoplasm, hyaline and homogeneous, forms slowly moving lobose 

 pseudopodia. Endoplasm granular, contains yellow globules and fat 

 granules. Disporous and polysporous. 



Spore: Subspherical in front view; oval in profile; anterior end being 

 more rounded than the posterior end. Shell rather thick, longitudinally 

 striated. In front view, the posterior end enlarged into a quadrangular 

 form, which appears as a small spine in side-view and which projects 

 backward long and fine filaments, usually six in number. Two well devel- 

 oped polar capsules open on each side of the sutural plane. Polar filament 

 coiled 5 to 6 times. Sporoplasm without any iodinophilous vacuole. 

 Dimensions: external length 10 to llju, internal length 7 to 9n, length of 

 polar capsules 4 to 4.5)u, length of polar filament up to 48/x, length of pos- 

 terior filaments up to 28/i. 



MITRASPORA ELONGATA nov. spec. 

 [Figs. 602 to 621] 



Habitat: In the urinary tubules and tissue of kidney of Lepomis 

 cyanellus; Crystal Lake, Urbana, 111. From June to July, all the fish 

 examined, 36 in number and 10 cm. in average length, were found to be 

 infected. Other fish such as Lepomis pallidus and Lepomis humilis, caught 

 at the same time, were free from the infection. Early in June, the number 

 and size of the parasites in a host body were rather small and only a small 

 number of spores could be recognized in the fresh state with the addition 

 of potassium hydrate solution. The growth of the parasite was rather 

 remarkable during the hot weeks in the latter part of June and July so 

 that every fish caught on July 17th showed a heavy infection, exhibiting 

 small whitish pustules over the surface of the organ. During June, 

 vegetative forms and spores were found in the lumen of the urinary tubules. 



