110 ILLINOIS BIOLOGICAL MONOGRAPHS ■ [348 



plasm granular, ectoplasm covering the entire surface of the body as a 

 thin layer. Each pansporoblast develops two spores, Polysporous. 



Spore: Elongated fusiform, similar to M. lieberkilhni, but much smaller. 

 Polar capsule at each end, extrudes filament under the action of nitric 

 acid. Sporoplasm granular with one nucleus. Dimensions: length 12ju, 

 breadth 3 to ^ix. 



MYXIDIUM GIGANTEUM Doflein 



[Fig. 258] 



1898 Myxidium giganteum Doflein 1898 : 285-286 



Habitat: Gall-bladder of Raja asierias; Napoli. 



Vegetative form: Rounded trophozoites. Lobose pseudopodia with 

 slow movement, show remarkable dimensions. Posterior portion forms 

 "Stemm-pseudopodien." Small form club-shaped. Endoplasm is of 

 yellowish color. Diameter of large form 500/x, of medium sized 200^*, small 

 individuals 70-90ai, quite young ones, polymorphous 8 to 40/i. Larger 

 individual up to 700/x by 180^. Many trophozoites form a cyst-like motion- 

 less stage, in which many individuals seem to be covered with a common 

 gelatinous envelope. Each pansporoblast forms two spores. Polysporous. 



Spore: Elongated. Fusiform in front view; in side view, one valve 

 arch-form, the other being flat. Transparent. Two polar capsules, one 

 at each end. Coiled polar filament is clearly seen in larger polar capsules. 

 Dimensions: length 28^, breadth S/x, polar capsules 8m by 4ju. 



MYXIDIUM BARBATULAE Cepede 



1906 Myxidium barbatulae C6pede 1906 : 67 



1906 Myxidium barbatulae Cepede 1906a : 15-16 



Habitat: Kidney of Cohitis barbatula L.; Isere. 



Vegetative form: Trophozoites form cysts. Form and size vary 

 greatly. Average size: 400 to 500^ in length and 200^1 in breadth. 



Spore: Irregular fusiform. Polar capsule at each end of the spore. 

 Shell longitudinally striated, number being variable. Dimensions: length 

 12 to 15/x, breadth about 6/i, polar capsules 5jw by 2,5 to 2>n. 



MYXIDIUM GIARDI Cepede 



[Figs. 259 to 261] 



1906 Myxidium giardi C6pede 1906a : 16; 1906b : 170-173 



1908 Myxidium giardi C6pede 1908 : 93-95 



1908 Myxidium giardi Cepede 1908a : 8 



Habitat: Kidney of Anguilla vulgaris Flem.; Wimereux (August). 



Vegetative form: Subspherical white cysts, 800 to QOOju in diameter, 

 surrounded by a thick (up to 30ju) membrane, composed of the connective 

 tissue of the host. 



