142 ILLINOIS BIOLOGICAL MONOGRAPHS [352 



Steplianophora ; an error lie afterwards corrected and placed the species 

 in the present genus. 



Ellis mentions the fact that the record of a species found by Craw- 

 ley among Leidy's manuscripts seems to indicate that the latter is the 

 same species as that which he describes as A. zophus. His words are as 

 follows : 



"Figs. 29 and 30 (Crawley 1903, PI. Ill), as taken from Leidy's Mss. are of 

 different Gregarines, a fact recognized by Crawley. Fig. 30 represents a grega- 

 rine closely related to G. grisea, while Fig. 29 is apparently of a sporont of 

 S. zopha." 



A comparison of 8. zopha (Fig, 74 of this paper) and of Leidy's draw- 

 ing (Fig. 65 of this paper) will indicate that there is a difference in 

 the shape of the sporonts. The protomerite of Leidy's species is wider 

 than the deutomerite ; in Ellis ', narrower. In the former it is flattened, 

 in the latter elongated. The deutomerite in the former tapers from 

 the septum to a long, sharply pointed posterior extremity. In S. zopha 

 the deutomerite is widest at the shoulder, a little below the septum and 

 is cylindrical for two-thirds of its length, ending in a slightly tapering, 

 bluntly pointed cone. From these facts and because the epimerite of 

 Leidy's species was not seen, I am inclined to think the two species are 

 not identical and that the one in Leidy's drawing should be relegated 

 to the list of indeterminate species. (See list of such species at end of 

 this chapter). 



ACTINOCEPHALUS GIMBELI (Ellis) Watson 



[Figures 126, 127] 



1913 Stenophora gimbeli Ellis 1913:464 



1916 Actinocephalus gimbeli Watson (This paper) 



Actinocephalus : Sporonts solitary, obese. Length 520jti. Width 

 not given. Ratio length protomerite : total length : : 1 : 5 to 1 : 6. 

 Ratio width protomerite : width deutomerite : : 1 : 2. Protomerite 

 broadly rounded in front, widest in middle portion, twice as wide as 

 high. Conspicuous constriction at septum. Deutomerite ovoidal, widest 

 through middle, tapering and ending in a bluntly pointed posterior 

 extremity. Endocyte very dense, black in deutomerite, lighter in pro- 

 tomerite, but dense in anterior end. Nucleus not seen. Cyst and spores 

 not known. 



Taken at Vincennes, Indiana. Host: Harpalus pennsylvanicus 

 Dej. Habitat: Intestine. 



