658 PROTOZOOLOGY 



Family 2 Coccomyxidae Leger and 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 and Hesse. Polar filament long, fine; 

 coelozoic parasite in marine fish (Leger and Hesse, 1907). 



C. morovi L. and H. (Fig. 284, o-t). In the gall-bladder of Clupea 

 pilchardus; spores 14 n by 5-6 /x (Georgevitch, 1926). 



Family 3 Myxosomatidae Poche 



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

 iodinophilous vacuoles. 



Genus Myxosoma Thelohan (Lentospora Plehn). Spore circular, 

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

 at anterior end; histozoic in marine or fresh water fish. Several 

 species. 



M. catostomi Kudo (Figs. 58; 275). In the muscle and connective 

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

 1926). 



M. cerebralis (Hofer) (Fig. 285, a). In the cartilage and perichon- 

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

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

 krankheit); spores 6-10m in diameter, (p. 648). 



M. funduli Kudo. In the gills of Fundulus; spherical cysts up to 

 360/x by 264^; spores pyriform, 14/x by 8/x by 6/x; polar capsules 8/x by 

 2 M (Kudo, 1918). Other species (Bond, 1938-1939). 



Genus Agarella Dunkerly. Spore elongate oval; 4 polar capsules 

 at anterior end; shell prolonged posteriorly into long processes. One 

 species. 



A. gracilis D. (Fig. 285, b). In the testis of South American lung- 

 fish, Lepidosiren paradoxa (Dunkerly, 1915, 1925). 



Family 4 Myxobolidae Thelohan 



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

 with an iodinophilous vacuole. 



Genus Myxobolus Butschli. 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. pjeifferi Thelohan (Fig. 285, e,f). In the muscle and connective 



