423] STUDJES ON MYXOSPORIDIA—KUDO 185 



29( 6) Shell-valves without marking, beside sutural ridge 30 



30(31) Anterior end of spore rounded; diameter 7 to S/z; one or two short spinous thick- 

 enings at posterior margin 



Chloromyxum fluviatile Thdlohan 1892 (89) 



31(30) Anterior end of spore mucronate or truncate 32 



32(33) Anterior end of spore mucronate; length 8m 



CMorotnyxum mucronatum Gurley 1893 (89) 



33(32) Anterior end of spore truncate; spore large; length 40 to 48 /x, breadth 30 to 38^ 



Chloromyxum magnum Awerinzew 1913 (92) 



34 ( 5) Spore rounded quadrangular in end view; conical in front view; parasitic in mus- 

 cular tissue of fish 35 



35(36) Length of spore larger than breadth; length 6/i, breadth 5m 



Chloromyxum quadratum Thelohan 1895 (88) 



36(35) Length (sutural diameter) of spore smaller than breadth 37 



37(38) Spore variable in form; anterior end narrower or broader than posterior end; 

 length 4 to 4.75m, breadth 5.4 to 6.5m 



Chloromyxum clupeidae Hahn 1917 (94) 



38(37) Anterior end of spore drawn out; almost circular in end view; length 6m, breadth 

 7.5m 



Chloromyxum funduli Hahn 1915 (93) 



Incompletely described species 



Chloromyxum diploxyi Gurley 1893 (90) 



Chloromyxum sp. Awerinzew 1908 (91) 



Genus SPHAEROSPORA Thflohan 1892 



1(8) Shell-valve of spore without marking except sutural ridge 2 



2( 7) Vegetative form amoeboid 3 



3( 4) Movements of vegetative form active. Spore: sutural ridge fairly well marked; 

 a pair of short filaments become visible at anterior end on warming; di- 

 ameter 8m 



Sphaerospora masovica Cohn 1902 (101) 



4( 3) Vegetative form without active movements 5 



5( 6) Spore: sutural ridge not prominent; polar capsule pyriform; diameter 8 to 13Mf 

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



Sphaerospora carassii Kudo 1919 (103) 



6( 5) Spore: sutural ridge prominent; polar capsule spherical; slightly attenuated at 

 anterior end; diameter 10 to 11m 



Sphaerospora elegans Thelohan 1892 (100) 



7( 2) Vegetative form produces cyst in tissue. Spore: diameter 8 to 9m 



Sphaerospora platessae Woodcock 1904 (102) 



8( 1) Shell-valves striated 9 



9(10) Polar capsules divergent; diameter of spore 10 to 12m, thickness 8m 



Sphaerospora diver gens Thdlohan 1895 . . ; (100) 



10( 9) Polar capsules not divergent 11 



11(14) Striation marked antero-posteriad 12 



12(13) Spore with a quadrangular lamella at anterior margin; striations ending in small 

 spines at posterior margin; length 12 to 14m, breadth 10 to 12m 



Sphaerospora rostrata Th61ohan 1895 (101) 



13(12) Spore smooth-contoured; polar capsules parallel to each other; diameter 7 to 10m 



Sphaerospora polymorpha Davis 1917 (102) 



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

 named. 



