CNIDOSPOPJDIA, MYXOSPORIDIA 



659 



tissue of body and various organs of Barbus barbus, B. fluviatilis, 

 and B. plebejus; tumor up to a diameter of 7 cm; most of infected 

 fish die from the effect (Keysselitz) ; spores 12-12. by. by 10-10. 5m. 



M. orbiculatus Kudo (Fig. 285, g-i). In muscle of Notropis gilberti; 

 spores 9-10m in diameter by 6.5-7m thick. 



M . conspicuus K. (Fig. 285, j, k). In corium of head of Moxostoma 

 breviceps; tumors 1/2-4 mm.; spores 9-11.5/x by 6.5-8m (Kudo, 1929). 



Fig. 285. a, Myxosoma cerebralis, showing two views of spore, X800 

 (Plehn); b, a spore of Agarella gracilis, X1660 (Dunkerly); c, d, front and 

 side views of fresh spores of Thelohanellus notatus, XI 530 (Kudo); e, f, 

 Myxobolus pfeifferi (Keysselitz) (e, Part of section of a cyst; f, a spore 

 treated with iodine solution, X 1 780) ; g-i, M. orbiculatus (Kudo) (g, in- 

 fected host's muscle, X600; h, a fresh spore; i, Lugol-treated spore, 

 X1000); j, k, views of fresh spores of M. conspicuus, X1530 (Kudo); l-o, 

 M. squamosus (1, a cyst under a scale, X6.5; m-o, views of fresh spores, 

 XI 530); p-r, spores of Henneguya exilis, XI 530; s-u, spores of Unicauda 

 clavicauda, X1530 (s, t, fresh spores; u, a stained spore without the proc- 

 ess (Kudo)). 



