246 ILLINOIS BIOLOGICAL MONOGRAPHS [456 



EXPLANATION OF PLATE 



Figures 275-289. Gregarina galliveri Watson. 



Fig. 275. A large association, X 100. 



Fig. 276. A smaller association, X 100. 



Fig. 277. Association at beginning of cyst formation, sporonts beginning to ro- 

 tate, X 100. 



Fig. 278. Association in process of rotation, X 100. 



Fig. 279. Complete cyst, still rotating, X 100. 



Fig. 280. Cyst after rotation has ended, X 100. 



Fig. 281. The sporont walls and nuclei have now disappeared and the contents 

 have become homogenous and shrunken, X 100. 



Fig. 282. The protoplasm has begun to collect in masses. X 100. 



Fig. 283. Cross section of cyst in stage shown in Fig. 282, showing incipient 

 gametes on surface of endocyte. X 245. 



Fig. 284. Three orange colored discs have appeared on the surface of the cyst. 

 X 100. 



Fig. 285. Nine discs are now present. X 100. 



Fig. 286. Exudation of spores from the ripe cyst through the long spore ducts. 

 The exuded spores remain attached in short chains, X 60. 



Fig. 287. A ripe spore with sporozoites. X 810. 



Fig. 288. An association from a starved host, showing the concavity in the end of 

 the primite. X 100. 



Fig. 289. A trophozoite attached to the epithelial wall of the host X loa 



