289] STUDIES ON MYXOSPORIDIA—KUDO 51 



Plasmogamy. Fusion of two trophozoites, coined by Doflein (1898). 

 Plasmotomy. — Division of trophozoite into daughter individuals, coined by 



Doflein (1898). 

 Polar capsule. — The pyriform or spherical, hollow body in the spore which 



forms a polar filament. 

 Polar filament. — The filament which is coiled inside the polar capsule. 

 Polysporous. — The character of the trophozoite of forming spores, more 



than two. 

 Posterior filament. — Fine posterior appendage of the spore. 

 Posterior processes. — Posterior differentiations of the shell. 

 Ridge. — Linear or network-like elevation of the shell of the spore. 

 Shell. — The envelope of the spore. 



Shell-valves. — Two valves which compose the shell of the spore. 

 Sporoplasm. — The protoplasmic mass found inside of the spore (amebula 



or sporozoite) , usually situated in the posterior portion of the spore. 

 Sutural diameter. — Same as length. 



Sutural edge. — The edge of the shell-valves cut by the sutural plane. 

 Sutural line. — The line on the shell of the spore marked by the sutural plane. 

 Sutural plane. — The plane on which two shell- valves meet together. 

 Sutural ridge. — The ridge marking the sutural line. 

 Tail. — The posterior prolongation of the valves from the median posterior 



end; it may be a single process or bifurcated. 

 Thickness. — See breadth. 



Trophozoite. — The vegetative or multiplicative stage of a Myxosporidian. 

 Vegetative form. — Same as trophozoite. 



