146 ILLINOIS BIOLOGICAL MONOGRAPHS [356 



BOTHRIOPSIS HISTRIO Schneider 



Bothriopsis: Sporonts solitary, maximum length 425fi. Width not 

 given. Ratio length protomerite : total length sporont : v 1 : 1.6. Width 

 protomerite : width deutomerite : : very variable. Length of protome- 

 rite more than half that of the whole sporont. Septum strongly convex 

 upward into protomerite. Deutomerit« stout, spindle shaped, ending 

 in a sharp point. Epimerite a small flattened disc from which project 

 a half dozen long slender filaments. Nucleus ovoidal, generally placed 

 diagonally, containing several karyosomes. Endocyte yellow in young, 

 brownish black in adults. 



Cysts spherical, 400 to 500/t. Spores obese, biconical, 7.2 by 5/*. 



Taken at Paris and Tourraine, France, and at Wyncote, Pa. Hosts : 

 Hydaticus cinereus, larv. ; Colymbetes fuscus; AcUius sulcatum; and Dy- 

 tiscus sp. larv. Habitat: Intestine. 



Schneider stated that this species is highly polymorphic, and he 

 described two varieties, the type form and a variety marginata, which is 

 more active. He found no epimerite, but this was discovered later by 

 Leger, who described it as consisting of six slender filaments, 80-90/* 

 long. Leger also discovered the spores. 



Crawley's observations on this species vary somewhat from those of 

 Schneider ; for instance, he says : 



" the protomerite is a large rounded mass, but whereas Schneider's figures 



represent it to be solid, I find that it contains, at least in some cases, a large cav- 

 ity. Within this cavity was a fluid in which floated a few granules. the sep- 

 tum dips backward. In a number of cases, however, the septum dipped forward, 

 and such appears to be the only condition seen by Schneider. ." 



Crawley found that in the stained si)ecimens the protomerite is 

 more densely granular than the deutomerite. 



BOTHRIOPSIS TERPSICHORELLA (Ellis) Watson 



[Figure 80] 



1913 Legeria terpsichorella Ellis 1913b :276 



1916 Bothriopsis terpsichorella Watson (This paper) 



Bothriopsis: Sporonts solitary, average length 720/*. Width 145fi. 

 Ratio length protomerite : total length : : 1 :1 to 1.8 : 1. Ratio width pro- 



