248 ILLINOIS BIOLOGICAL MONOGRAPHS [186 



EXPLANATION OF PLATE 



Figs. 474 to 476, Myxobolus funduli. After Hahn (1915 and 1917). 



Fig. 474. A cyst from the gill filament (1917, Fig. 1). 



Fig. 475. A stained spore (1915, Fig. 28). X2000. 



Fig. 476. Diagram of the cross section of a spore (1915, Fig. 30). 



Fig. 477. A spore of Myxobolus pleuronectidae. After Hahn (1917a, Fig. 2). X157S. 



Fig. 478. A spore of Myxobolus capsulatus. After Davis (1917, Fig. 139). X1500. 



Figs. 479 and 480. Spores of Myxobolus nodularis. After Southwell and Prashad (1918, 

 PI. 11, Figs. 34 and 35). X about 1450. 



Fig. 481. A sf)ore of Myxobolus miyairii. After Miyairi (1909, Fig. 14). 



Figs. 482 to 485. Spores of Myxobolus koi. Original. X 1300. 



Figs. 482 to 484. Different views. 



Fig. 485. A spore stained with Giemsa's mixture. 



Figs. 486 and 487. Henneguya psorospermica. After Th€lohan (1895). 



Fig. 486. A cross section thru branchial lamella of Esox lucius with a cyst (1895, Fig. 82). 



Fig. 487. Two spores (1895, Figs. 83 and 84). X about 1000. 



Figs. 488 and 489. Henneguya minuta. After Cohn (1895). 



Fig. 488. A longitudinal section of an infected branchial lamella (1895, Fig. 29.) 



Fig. 489. Two spores. One with two vacuoIes(?) (1895, Fig. 30). X about 450. 



Fig. 490 and 491. Spores of Henneguya oviperda. After Cohn (1895, Fig. 31). 



Fig. 491. A spore with extruded "starren Faden" and polar filaments. 



Figs. 492 and 493. Henneguya lobosa. After Cohn. 



Fig. 492. An external view of the parasite on the gill (1895, Fig. 18). 



Fig. 493. Two spores and one unseparated young spores (1895, Fig. 21). 



Figs. 494 and 495. Henneguya media. After TMlohan (1890b). 



Fig. 494. A sporoblast in the ovary of Gasterosteus, with one spore (1890b, Fig. 18). 



Fig. 495. Spores (1890b, Fig. 1). 



Fig. 496. The peripheral portion of a section of a cyst of Henneguya psorospermica, show- 

 ing the characteristic structure. After Th^lohan (1895 : 237). 



Figs. 497 to 499. Spores of Henneguya schizura. After Muller (1841, Fig. 1). 



Figs. 500 to 503. Spores of Henneguya creplini. After Creplin (1842, Figs. B, E, A and C). 



Fig. 504. Spores of Henneguya linearis. After Miiller (1841, Fig. 10). 



