184 ILLINOIS BIOLOGICAL MONOGRAPHS [422 



3( 2) Posterior appendage single or bifurcated; length 8^, breadth 6 to 7ju, appendage 

 10m long 



Cfdoromyxum caudatum Thelohan 1895 {8S) 



4( 1) Spore without posterior appendage 5 



5(34) Spore circular or subcLrcular in front view; parasitic in body cavity of host 6 



6(29) Shell-valves marked with striations or ridges 7 



7(24) Main part of striations op ridges parallel to sutural line 8 



8(11) Shell-valves partially marked 9 



9(10) Ridges on each shell- valve variable in number (six found in original drawing) 

 running closely to sutural line; diameter lO.Sju 



Chloromyxum dubium Auerbach 1908 (91) 



10( 9) Each shell-valve with one ridge from which eight to twelve short ones are directed 

 toward centre of valve; oval in profile; length and breadth 8 to lO/t, thickness 

 5 to 7/1 



Chloromyxum trijugum Kudo 1919 (96) 



11( 8) Entire shell-valve marked 12 



12(19) Shell-valve marked with fine striations 13 



13(16) Spore oval in lateral view 14 



14(15) Trophozoite larger; size up to 50/x by 20^; polysporous (up to eight spores) rarely 

 disporous. Spore: length 8 to 9/li, breadth 6 to 7^, thickness 5 to 6/i 



Chloromyxum misgurni Kudo 1916 ; (93) 



15(14) Trophozoite smaller; size up to 35/x in diameter; polysporous (up to six spores) 

 or disporous. Spore: length 8m, breadth 7m, thickness 5 to 6m 



Chloromyxum catostomi Kudo 1919 (98) 



16(13) Spore circular in lateral "view 17 



17(18) Trophozoite rounded; 40 to 45m by 28 to 40m. Spore: diameter 10 to 13m, polar 

 capsule 4 to 6m long 



Chloromyxum prolei Joseph 1905 (90) 



18(17) Trophozoite irregular form; 33 to 35m in average length. Spore: striations 

 thicker and somewhat wavy; diameter 9 to 9 . 5m, polar capsule 3fi long 



Chloromyxuvi thymalli Lebzelter 1912 (92) 



19(12) Shell-valves marked with ridges 20 



20(21) Trophozoite small (average diameter of adults about 20m); monosporous, rarely 

 disporous. Spore : sheU-valves with ridges marked antero-posteriad; diameter 

 10 to 11m 



Chloromyxum cristatum Leger 1906 (91) 



21(20) Trophozoite large, diameter reaching 40 to 50m 22 



22(23) Ridges on shell- valves united into a line at each end and unequal in thickness; 

 spore small; length 10 to 12m, breadth 8 to 10m 



Chloromyxum fujitai Kudo 1916 (93) 



23(22) Shell-valve with two circular and two small ridges; spore large; length 16m, 

 breadth 10m 



Chloromyxum koi Fujita 1913 (92) 



24( 7) Striations or ridges not parallel to sutural line 25 



25(26) Striations irregular; posterior margin thickened at sides; diameter 7 . 5 to 9m 



Chloromyxum wardi Kudo 1919 (99) 



26(25) Striations parallel to each other 27 



27(28) Striations forming acute angles with sutural line; diameter 8 to 9m 



Chloromyxum iruttae L6ger 1906 (90) 



28(27) Four ridges on posterior half of shell-valve converging toward anterior end; 

 diameter 7 m 



Chloromyxum granulosum Davis 1917 (96) 



Number senclosed in parentheses refer to the page of the article on which is found the description of the species 

 named. 



