CNIDOSPORIDIA, MYXOSPORIDIA, ACTINOMYXIDIA 309 



Sphaerspora polymorpha Davis (Fig. 131, d). In the urinary 

 bladder of Opsaus tau. The spore measures 7 to 10 microns in 

 diameter. 



Genus Sinuolinea Davis. The spore with or without lateral 

 processes. Sutural line sinuous; two polar capsules. In the 

 urinary bladder of marine fish. 



Sinuolinea dimorpha Davis (Fig. 131, e, f). In Cynoscion 

 regalis. The spore is 15 microns in diameter. 



Genus Unicapsula Davis. Spore with one polar capsule. 

 Shell-valves asymmetrical; sutural line sinuous (?). Histozoic 

 in marine fish. One species. 



Unicapsula tnuscularis Davis (Fig. 131, g). The spore is 

 about 6 microns in diailieter. In the muscle fibers of the halibut 

 on the Pacific coast of North America. The cause of the 

 "wormy" halibut (Davis). 



Suborder 3 Platysporea Kudo 



Without iodinophilous vacuole 



Two polar capsules; one at each pole Family 1 Myxidiidae 



One polar capsule Family 2 Coccomyxidae 



2 or 4 polar capsules at anterior end Family 3 Myxosomatidae 



With an iodinophilous vacuole Family 4 Myxobolidae 



Family 1 Myxidiidae Thelohan 



Genus Myxidium Biitschli. The spore fusiform with pointed 

 or rounded ends. Polar filament is comparatively long and fine. 

 Coelozoic or histozoic in fishes and also in reptiles. Numerous 

 species. 



Myxidium lieberkuhni Biitschli (Fig. 132, a-d). In the uri- 

 nary bladder of various species of Lucius. The spore measures 

 18 to 20 microns by 5 to 6 microns. Widely distributed. 



Genus Sphaeromyxa Thelohan. Spore fusiform, but ends 

 are usually truncate. Polar filament short and thick. Tropho- 

 zoites large and discoid. Coelozoic in marine fish and amphi- 

 bians. Several species. 



Sphaeromyxa balbianii Thelohan (Fig. 132, e-g). In the gall 

 bladder of species of Motella and other marine fishes in Europe 

 and of Siphostoma in the United States. The spore measures 15 

 to 20 microns long by 5 to 6 microns broad. 



