71] STUDIES ON GREG ARI NES RAM M 71 



The fact that this species is found in such widely varying hosts is 

 unusual but not unique in the history of gregarines. 



Genus PRISM ATOSPORA Ellis 1914: 215 



Spores hexagonal, truncate at ends with one row of long spines at each 

 pole. Epimerite subglobose with lateral recurved hooks. 



PRISMATOSPORA EVANSI Ellis Type species 



[Figures 95, 96, 97, and 99] 

 1914 Prismatospora evansi Ellis 1914: 215 



Sporonts broadly conical 400/tt in average length. Ratio LP:TL: :1:3; 

 WP:WD: :1:1. Protomerite broad, blunt, deutomerite tapering. Nucleus 

 small, spherical. 



Cysts subspherical, 370/u in diameter. Dehiscence by simple rupture. 

 Spores as in genus, six long spines encircling each pole a short distance 

 from the end, 11 by 5.8/t. 



Intestine of Tramea lacerata Hagen. and Sympetrum rubicundttlum 

 Say. 



Taken at Douglas Lake, Michigan. 



The sporonts of this species are peculiar in that the protomerite is drawn 

 out into digitiform processes at the apex in vivo, which may aid the 

 animal in retaining its hold upon the intestine in so active a host where ab- 

 dominal contractions might thrust it from the canal. These processes disap- 

 pear when the animal is placed in water. 



Family MENOSPORIDAE Leger 1892:168 



Sporonts solitary. Epimerite a large cup bordered with hooks and 

 placed on a long slender collar. Cyst dehiscence by simple rupture. 

 Spores crescentic, smooth. 



Genus MENOSPORA Leger 1892:151, 168 

 Characters of the family. 



MENOSPORA POLYACANTHA Leger Type species 

 [Figures 30, 31 and 32] 



1892 Menospora polyacantha Leger 1892: 151 



1899 Menospora polyacantha Labbe 1899: 30 



1903 Menospora polyacantha Minchin 1903:201,332 



1913 Menospora polyacantha Ellis 1913: 275 



Sporonts ovoidal, lanceolate, 600-700** in length. Width not given. 

 Ratio LP:TL: : (trophozoite, without epimerite) 1:5; WP:WD: :1:1.1. 

 Protomerite well rounded, deeply constricted at septum. Deutomerite 

 widest just below septum, tapering gradually to a long sharply pointed 



