192 ILLINOIS BIOLOGICAL MONOGRAPHS [430 



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

 gated; length 12 to \2.Stx, breadth 10 to 10. Sn, polar capsule 5.5 to 6ju long 



Myxobolus pfeifferi Thelohan 1895 (133) 



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

 length 11 to 12 n, breadth 9 to 9.5^, thickness 4.5 to 5m, polar capsule 5m by 2.5m 



Myxobolus scardinii Reuss 1906 (146) 



65(62) Markings indistinct 66 



66(67) Markings 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 (147) 



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 (147) 



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

 polar capsule 4 to 6m long 



Myxobolus musculi Keysselitz 1908 (148) 



69(50) Spore without intercapsular appendix 70 



70(75) Length of spore less than 10m ^1 



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

 3(1 by 2m 



Myxobolus minutus Nemeczek 1911 (150) 



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



73(74) SheU thick; length 9 . 25 to 10m, breadth 7 . 25 to 8 . 25m, thickness 4 to 5m 



Myxobolus sandrae Reuss 1906 (146) 



74(73) Shell thin; spore 8.25 to9.5M 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 15m, breadth 9 to 11m 



Myxobolus ellipsoides Thelohan 1892 (136) 



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



8 1 (82) Sutural edge with markings ; slightly truncate at anterior end in front view ; spore 

 9.5 toll.5Mlong, 8.5 to 9. 5m broad, 6.5m thick, polar capsule 4.75m by 1-5 

 to 2m 



Myxobolus mes enter icus Kudo 1919 (157) 



82(81) Sutural edge without markings 83 



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



Myxobolus lintoni Gurley 1893 (138) 



84(83) Polar capsules smaller; spore 14. 5m long, 11 .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 sometunes present; spore 13 to 17m long, 8 to 10m broad, 5 to 7m thick, 

 polar capsule 6 to 7m long 



Myxobolus carassii Klokacewa 1914 (150) 



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

 named. 



