226 THE ROYAL SOCIETY OF CANADA 



Type species — *E. cooperi (Huntsman, 1913, p. 134). 

 This genus is conveniently divided into three sub-genera. 



Sub-gen. Euritteria nov. 



Dorsal lamina with smooth margin. Opening between horns of 

 dorsal tubercle directed to left. Intestinal loop little or moderately" 

 curved. Left gonad rather closely applied to intestinal loop and 

 extending forward out of secondary loop. Right gonad extending 

 forward beyond renal organ. 



Type species — E. cooperi (Huntsman, 1913, p. 134). 



The only other species is E. regularis (Ritter). 



Sub-gen. Comita nov. 



{Comes, a companion, in allusion to the course of vas deferens). 



Dorsal lamina with margin smooth or nearly so. Dorsal tubercle 

 with opening between horns directed variously, usually to left or 

 anteriorly. Intestinal loop somewhat strongly curved into a second- 

 ary loop. Left gonad in secondary loop. Right gonad extending 

 around and below anterior end of renal organ. 



Type species — E. arenata (Stimpson). 



Other species are E. impura (Heller), and E. occidenlalis (Traust.). 



Sub-gen. Euperiptycha nov. 



Dorsal lamina more or less toothed on margin. Dorsal tubercle 

 with opening between horns directed posteriorly or to right. In- 

 testinal loop strongly curved into a secondary loop. Left gonad 

 embraced by secondary loop {Trepi-KTvxr]^, embraced). Right gonad 

 entirely above renal organ. 



Type species — E. socialis (Alder). 



Other species are E. tubifera (Orsted), E. dentifera (van Beneden), 

 E. greefi (Michaelsen), and E. lutkeniana (Traust). 



EUGYRIOPSIS Roule 



Pharynx with seven folds on each side. Infundibula extending 

 into folds, each having many short stigmata spirally arranged. Dorsal 

 lamina with smooth margin. Dorsal tubercle horseshoe-shaped with 

 incurved horns; opening between horns directed backwards and to 

 left. 



