466 PROTOZOOLOGY 



Z. hildae A. (Fig, 215, m, n). In urinary bladder of Gadus spp.; 

 spores 16-29m by 13-18//. 



Family 2 Coccomyxidae Leger et Hesse 



Spore ellipsoidal ; one polar capsule at one end ; circular in cross- 

 section; undoubtedly a border-line form between Myxosporidia 

 and Microsporidia. 



Genus Coccomyxa Leger et Hesse. Polar filament long, fine; 

 coelozoic parasite in marine fish. 



C. morovi L. et H. (Fig. 215, o-t). In gall-bladder of Clwpea pil- 

 chardus; spores 14/^ by 5-6ac. 



Family 3 Myxosomatidae Poche 



2 or 4 polar capsules at anterior end; sporoplasm without any 

 iodinophilous vacuoles. 



Genus Myxosoma Thelohan (Lentospora Plehn). Spore circu- 

 lar, oval or ellipsoid in front view, lenticular in profile; 2 polar 

 capsules at anterior end; histozoic in marine or freshwater fish. 

 Several species. 



M. catostomi Kudo (Figs. 54; 208). In muscle and connective 

 tissue of Catostomus commersonii; spores 13-15/x by 10-1 1.5^. 



M. cerebralis (Hofer) (Fig. 216, a). In cartilage and perichon- 

 drium of salmonoid fish; young fish are especially affected by in- 

 fection, the disease being known as the "twist-disease" (Dreh- 

 krankheit) ; spores 6-lOju in diameter. 



Genus Agarella Dunkerly. Spore elongate oval; 4 polar cap- 

 sules at anterior end ; shell prolonged posteriorly into long proc- 

 esses. One species. 



A. gracilis D. (Fig. 216, h). In testis of South American lung- 

 fish, Lepidosiren paradoxa. 



Family 4 Myxobolidae Thelohan 



1, 2, or 4 polar capsules grouped at anterior end; sporoplasm 

 with iodinophilous vacuole. 



Genus Myxobolus Biitschli. Spores ovoidal or ellipsoidal, flat- 

 tened ; 2 polar capsules at anterior end ; sporoplasm with an iodin- 

 ophilous vacuole; sometimes with a posterior prolongation of 

 shell; exclusively histozoic in freshwater fish or amphibians. 

 Numerous species. 



M. pfeifferi Thelohan (Fig. 216, e,f). In muscle and connective 



