194 ILLINOIS BIOLOGICAL MONOGRAPHS [432 



3(6) Length of tail equal to two- thirds of length of main part of spore* 4 



4( 5) Shell-valves asymmetrical; spore smaller; total length 38 to 48;u, length of main 

 part 15/i, breadth 6 to 7.5m, polar capsule 7 .5 to 9^ by 3 to 3. Six. Tropho- 

 zoite disporous and polysporous 



Henneguya gaiierostei Parisi 1912 (169) 



5( 4) Shell-valves symmetrical; spore broader; length of main part 13.5 to 15/*, 

 breadth 8 to 9ju, thickness 6 to 7 . 5m, polar capsule 5 to 6m by in, length of tail 

 30 to 40m. Trophozoite mictosporous 



Henneguya mictospora Kudo 1919 (173) 



6( 3) Length of tail equal to half of length of main part of spore and single(?) ; length 

 20 to 24m, breadth 5 to 6m, length of polar capsule 4 to 5m 



Henneguya media Thelohan 1892 (161) 



7(2) Shell-valves unstriated 8 



8( 9) Spore elongated; polar capsule longer; posterior portion of main part broad; tail 

 wider and bifurcated to same direction; total length 19.5 to 22.5m, length of 

 main part 8.5m, breadth 6m, length of tail 8 to 8.5m 



Henneguya legeri Cepede 1905 (1^^) 



9( 8) Spore oval; polar capsule shorter; posterior part of main portion narrow; tail 

 narrower and bifurcated to opposite directions; length of main part 11.5m, 

 breadth 7m, length of tail 9.6m, polar capsule 3.5m by 2.5m 



Henneguya wisconsinensis Mavor et Strasser 1916 (170) 



10( 1) Parasitic in tissue of host . . .' 11 



11(28) Tail always appears as a single process 12 



12(13) Spore small; length 4m, breadth 2m 



Henneguya tenuis Vaney et Conte 1901 (1(^6) 



13(12) Spore longer and larger, at least 27m long 14 



14(15) Sutural edge with eight to ten markings; tail rather long; length of main part 10 

 to 11 .5m, breadth 8 to 8. 75m, thickness 4 to 5m, polar capsule 3 to 4m by 2m, tail 

 up to 17m long 



Henneguya brackyura Ward 1919 (171) 



15(14) Sutural edge without markings 16 



16(19) Total length of spore greater than 40m 17 



17(18) Anterior end rounded; polar capsule large; shell-valves asymmetrical; tail long; 

 main part 10 to 11m long, 6 to 8m broad, 4m thick, tail 30 to 40m long. Cysts 

 elongated and large up to 6 mm. by 2 mm. 



Henneguya macrura Gurley 1894 (164) 



18(17) Anterior end attenuated; polar capsule smaller;' shell- valves symmetrical; tail 

 shorter; length 20m, breadth 8 to 9m, polar capsule 8m by 2 to 3n. Cysts 

 elongated oval and smaller, 1 . 1 mm. by . 5 mm. 



Henneguya crepUni Gurley 1894 (162) 



19(16) Total length of spore less than 40m 20 



20(21) Tail about one-third of main part; total length 38m, main part 26m long, 10 to 11m 

 broad, 8m thick, polar capsule 1 1 to 14m by 2 to 3m. Cysts oval, numerous and 

 small (130m by 115m) 



Henneguya minuta Cohn 1895 (160) 



21(20) Tail about three-sevenths of main part; total length 29 to 40m, main part 15 to 



20m long, 7 to 8m broad, polar capsule 8m by 2m 22 



22(25) Cysts large 23 



*Length of main part of spore denotes in all possible cases the distance between the outer 

 anterior tip and the posterior margin of sporal cavity; and consequently that between the 

 latter and the distal end of the tail is the length of the tail. 



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

 named. 



