192 ILLINOIS BIOLOGICAL MONOGRAPHS [430 



63(64) Marking variable in number along posterior margin of spore; spore more elon- 

 gated; length 12 to 12.5a(, breadth 10 to IO.Sai, polar capsule 5.5 to 6^ long 



Myxobolus pfeiferi Thdohan 1895 (133) 



64(63) Sutural edge with four markings around posterior margin; spore rather short; 

 length 1 1 to 12m, breadth 9 to 9.5At, thickness 4.5 to 5m, polar capsule 5m by 2.5m 



Myxobolus scardinii Reuss 1906 (14^) 



65(62) Markings indistinct 66 



66(67) Markinp about five at posterior margin; spore larger and shorter; length 11 to 

 12m, breadth 9.25 to 10m, thickness 4.5 to 5 . 5m, polar capsule 4 to 5m by 2 . 25m 



Myxobolus bramae Reuss 1906 (J'i?) 



67(66) Markings many along entire sutural edge except anterior tip; spore smaller, 

 longer and thicker; length 9 . 25 to 10m, breadth 7 to 7 . 25m, thickness 5 to 5 . 5m, 

 polar capsule 4. 5m by 2 . 5 to 3m 



Myxobolus cyprinicola Reuss 1906 (l^) 



68(51) Intercapsular appendix rounded; sutural edge smooth; length 11m, breadth 8m, 

 polar capsule 4 to 6m long 



Myxobolus musculi Keysselitz 1908 (i48) 



69(50) Spore without intercapsular appendix 70 



70(75) Length of spore less than IOm 71 



71(72) Spore very much flattened and small; length 6m, breadth 4 . 2 to 5m, polar capsule 

 3n by 2m 



Myxobolus minutus Nemeczek 1911 (ISO) 



72(71) Thickness of spore about half of length 73 



73(74) Shell thick; length 9 . 25 to IOm, breadth 7 . 25 to 8 . 25m, thickness 4 to 5m 



Myxobolus sandrae Reuss 1906 (146) 



74(73) Shell thin; spore 8.25 to 9.5m long, 7.25 to 8.25m broad, 4.5 to 5.5m thick 



Myxobolus volgensis Reuss 1906 (145) 



75(70) Length of spore greater than 10m 76 



76(85) Extremities of spore approximately equal 77 



77(80) Spore elongated (breadth: length = l:1.8 or 1:1.4) 78 



78(79) Spore larger; length 14 to 17m, breadth 8.5m, thickness 5 to 6m 



Myxobolus oblongus Gurley 1893 (139) 



79(78) Spore smaller; length 12 to 15 m, breadth 9 to 11m 



Myxobolus ellipsoides Thdohan 1892 (136) 



80(77) Spore shorter (breadth: length = l:1.3, 1:1.2 or 1:1.1) 81 



81(82) Sutural edge with markings; slightly truncate at anterior end in front view; spore 

 9.5 to 11.5m long, 8.5 to 9. 5m broad, 6.5m thick, polar capsule 4. 75m by 1.5 

 to 2m 



Myxobolus mesenlericus Kudo 1919 (157) 



82(81) Sutural edge without markings 83 



83(84) Polar capsule larger; spore 13 .9m long, 11m broad, 8m thick 



Myxobolus lintoni Guriey 1893 (138) 



84(83) Polar capsules smaller; spore 14 . 5 m long, 1 1 . 9m broad, polar capsule 6m by 3 . 7m 



Myxobolus pleuronectidae Hahn 1917 (152) 



85(76) Anterior end of spore more attenuated than posterior 86 



86(89) Sutural edge with markings 87 



87(88) Markings five or six in number; spore 17 to 18m long, 10 to 13m broad, polar cap- 

 sule 7 to 8m 



Myxobolus permagnus Wegener 1910 (149) 



88(87) Markings sometimes present; spore 13 to 17m lo°gj 8 to 10m broad, 5 to 7m thick, 

 polar capsule 6 to 7 m long 



Myxobolus carassii Klokacewa 1914 (150) 



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

 named. 



