462 



PROTOZOOLOGY 

 C 



Fig. 213. Unicapsula muscularis (Davis), a, b, infected muscle fibers, 

 X20; c, cross-section of an infected muscle, Xl90; d, X575; e-h, 

 spores, X2500. 



shell-valves asymmetrical; sutural line sinuous'; histozoic in ma- 

 rine fish. One species. 



U . muscularis D. (Fig. 213). Spore about 6/x in diameter; 2 uni- 

 nucleate sporoplasms; in muscle fibers of halibut, Pacific coast of 

 North America; the cause of the "wormy" halibut (Davis). 



Family 2 Sphaerosporidae Davis 



Genus Sphaerospora Thelohan. Spore spherical or subspheri- 

 cal; sutural line straight; 2 polar capsules at anterior end; coelo- 

 zoic or histozoic in marine or freshwater fishes. 



