186 ILLINOIS BIOLOGICAL MONOGRAPHS [424 



14(11) Faint concentric striations; pointed at sides and middle part of posterior margin; 

 polar capsules unequal in size; length 7 to 8m, breadth 6 to 7ai, thickness Sn 



Splioerospora angulata Fujita 1912 (102) 



Incompletely described species 



Sphaerospora sp. Davis 1917 (103) 



Sphaerospora sp. Southwell et Prashad 1918 (103) 



Genus SINUOLINEA Davis 1917 



1( 4) Spore with two processes 2 



2( 3) Processes lateral and long (20m); spore: 9 to lift long, 9^ broad, process 18 to 

 22ft long 



Sinnolinea brachiophora Davis 1917 (106) 



3( 2) Processes posteriad from sides and short; diameter 12 to 13^. Trophozoite 

 opaque 



Sinuolinea opacita Davis 1917 (106) 



4( 1) Spore without process 5 



S( 6) Trophozoite with active amoeboid movements. Spore: sutiural ridge S-shaped 

 at anterior part; length ISm, breadth 12m, thickness 8m 



Sintiolinea arborescens Davis 1917 (105) 



6( 5) Trophozoite with slow amoeboid movements  7 



7( 8) Sutural plane much twisted on its axis; capsulogenous cells large occupying more 

 than half of sporal cavity; polar capsules opening on opposite sides; diameter 

 12 to 14m 



Sinuolinea capsularis Davis 1917 (lOS) 



8( 7) Sutural plane not much twisted; diameter ISm 



Sinuolinea ditnorpha Davis 1916 (104) 



Genus MYXIDIIIM ButschU 1882 



1(16) Breadth of spore equal to or more than half of length 2 



2( 7) Shell-valves imstriated 3 



3( 6) Sutural plane curved into anS 4 



4( 5) Spore small; length 8 to 12m, breadth 4 to 6m 



Myxidium incurvatum Thelohan 1892 (108) 



5( 4) Spore large; much broader; length 20.8 to 23.4m, breadth 13 to 15.6m 



Myxidium inflatum Auerbach 1909 (HI) 



6( 3) Sutural plane straight; spore cylindrical; surroimded by a gelatinous envelope; 



length 10 to 11m, breadth 6m 



Myxidium glutinosum Davis 1917 (115) 



7( 2) Shell-valves striated 8 



8( 9) Sutural line curved into an S; form oval; circular in cross-section; openings of 



polar capsules pointed; length 11 to 13m, breadth 8 to 9m 



Myxidium oviforme Parisi 1912 (114) 



9( 8) Sutural line straight 10 



10(13) Sutural line coincides with longitudinal axis of spore 11 



11(12) Sutural ridge distinct; extremities mucronate; length 9 to 10m, breadth 5 to 5 . 6m, 



thickness 4 . 75 to 5 m. Vegetative form produces cysts, 800 to 900m in diameter 



Myxidium giardi Cep^de 1906 (HO) 



12(11) Sutural ridge faintly marked; extremities gradually drawn out; length 11m, 



breadth 8m. Trophozoite large and leaf-like; diameter up to 1 .35 mm. 



Myxidium phyllium Davis 1917 (116) 



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

 named. 



