417] STUDIES ON MYXOSPORIDIA—KUDO 179 



13(12) Spore angular, not rounded 14 



14(15) Spore pyramidal in front view; with its base at anterior end; with or without dis- 

 tinct anterior processes; shell smooth 



Genus Myxoproteus Doflein 1898 (183) 



15(14) Spore isosceles triangular in front view; anterior end attenuated; polar capsules 

 spherical and large; shell with fine network-like ridges; with posterior fringe- 

 like processes 



Genus Wardia Kudo 1919 (183) 



16( 7) Largest diameter of spore coincides with or at an acute angle to sutural plane; 

 one or two polar capsules which are in sutural plane 



Suborder Platysporea Kudo 1919 17 



17(22) Spore fusiform; two polar capsules, one at each end of spore 



Family Myxidiidae Thelohan 1892 18 



18(21) Spore more or less regularly fusiform; shell-valves sjTnmetrical 19 



19(20) Polar filament fine and long 



Genus Myxidium Biitschli 1882 (186) 



20(19) Polar filament thick and short 



Genus Sphaeromyxa Thelohan 1892 (^88) 



21(18) Spore semi-circular in front view; polar filament fine 



Genus Zschokkella Auerbach 1910 (188) 



22(17) Spore not fusiform; with one or two polar capsules at anterior extremity 23 



23(26) Sporoplasm without iodinophilous vacuole 



Family Myxosomatidae Poche 1913 24 



24(25) Spore elongated ovoid in front view; anterior end mostly pointed 



Genus Myxosoma Thelohan 1892 (i^^) 



25(24) Spore more or less rounded in front view 



Genus Lentospora Plehn 1905 (189) 



26(23) Sporoplasm always with iodinophilous vacuole 



Family Myxobolidae Thelohan 1892 27 



27(30) Spore with posterior process; shell sometimes striated 28 



28(29) Process more or less long, projecting posteriad along median line of spore; process 

 either single or double; shell sometimes striated 



Genus Henneguya Thelohan 1892 (193) 



29(28) Process short projecting posteriad from sides; shell longitudinally striated 



Genus Hoferellus Berg 1898 (173) 



30(27) Spore without posterior process; shell unstriated; one or two polar capsules 



Genus Myxobolus Butschli 1882 (189) 



II. KEY TO THE SPECIES 

 Genus LEPTOTHECA Thdlohan 1895 



1(14) Spore: sutural diameter always more than half of greatest breadth 2 



2( 7) Average sutural diameter less than 10^ 3 



3(4) Posterior margin of spore concave in front view ; sutural diameter 8 to 9/*, breadth 



12 to 14m. Trophozoite usually with a long process 



Leptolheca longipes Auerbach 1910 (63) 



4( 3) Posterior margin of spore not concave 5 



5( 6) Posterior margin of spore flattened; polar capsules pyriform; sutural diameter 6 



to 7 m, breadth 11 to 12 p. Trophozoite with actively motile long filiform 



pseudopodia at rounded end 



Leptolheca agilis Thelohan 1892 (60) 



Numbers enclosed in parentheses refer to the page of the article on which is found the description of the species 

 named. 



