340 SPOROZOA. 



2. FamUyMYXOBOLID^Thelohan, 1892. 



Spore with one or two polar capsules at the anterior end, 

 with or without posterior processes. Sporoplasm with an 

 iodinophilous vacuole. Majority polysporous in freshwater 

 Fish. 



Key to Indian Genera. 



1 (2). Each valve of spore prolonged into a [p. 344. 



long process Henneguya Thelohan, 



2(1). Valves without posterior processes. ... 3. [p. 340. 



3 (4). Spores ovoidal ; two polar capsules . . Myxobolus Biitschli, 



4 (3). Spores pyriform ; one polar capsule . . Thelohanellus Kudo, 



[p. 342. 



Genus MXYOBOLUS BiitschH, 1882. 



Myxobolus, Biitschli. 1882, pi. xxxviii, figs. 6-10 ; Labbe, 1899, 

 pp. 97-101 ; Kudo, 1920, pp. 58, 128-58 ; Wenyon, 1926, p. 727 ; 

 Reichenow, 1929, pp. 1668-72; Kudo, 1931, p. 312; 1933, 

 pp. 198, 208-10 ; Calkins, 1933, p. 568 ; Reichenow, 1935, p. 388. 



Spore ovoidal, flattened. Shell without posterior processes. 

 Two pyriform polar capsules at the anterior end. Sporo- 

 plasm with an iodinophilous vacuole. This genus includes 

 many species ; the majority are polysporous and tissue- 

 parasites of freshwater Fish, but a few are known from marine 

 Fish, an Annelid, and an Amphibian. 



Key to Indian Species. 



1 (4). Spore with unequal polar capsules 2. p. 340. 



2 (3). Spores oval, 12-4-15)iiby 8-2-lOitt ■ M. calbasui Chak., 



3 (2). Spores spherical to oval, 7-21-8-24/i, in [p. 341. 



length M. mrigalae Chak., 



4 (1). Spore with equal polar capsules 5. [& Prash., p. 341. 



5 (6). Spores ovoidal, 9/x by 7-2 /^ M. nodularis Southw. 



6 (5). Spores spherical, 13/n in diameter .... M. sp., Southw., 



[p. 342. 



285. Myxobolus calbasui Chakravarty. 



■fMyxoboltis sp. (part), Ray, 1933 6, p. 349. 

 ^Myxobolus calbasui, Chakravarty, 1938. 



Trophozoites spherical to oval. Polysporous. Spores oval, 

 rounded at the posterior and pointed at the anterior end, 

 sutural plane distinct. Sporoplasm occupjdng the posterior 

 region of the spore. Polar capsules pyriform, one smaller 

 than the other. Coiled polar filaments well marked, unequal 

 in length when extruded. A spherical iodinophilous vacuole 

 present. 



Dimensions. — Spore 12-4-15 ;u, in length, 8-2-10 /a in breadth ; 

 polar capsules 6-18)u, by 4-12^ and 4-12/i, by 3"09yLt ; polar 

 filaments 125 /x and 60 ft respectively ; iodinophilous vacuole 

 4- 1 ju. in diameter. 



Remarks. — Description is based on Chakravarty's paper 

 in manuscript. 



