636 



Plate C 



Fridcricia tciiera — cont. 



Fig. it. Outline of nephridium. 



Fig. is. Longitudinal section of intestine in chylus cell region. 



Fig. 19. Outline of spermiducal funnel. 



Fig. 20. Penial bulb in a transverse section of the worm. 



Fig. 2^. Outline of spermatheca. 



Fridericia ogilis 



Fig. 23. Outline of brain, dorsal view. 



Fig. 23. Longitudinal section of intestine in cliylus cell region. 



Plate CI 



Fridcricia agilis — cont. 



Fig. 24. Outline of nephridium. 



Fig. 2.">. Outline of nephridium of the type in which iIk' poslseplal part is re- 

 jected cephalad. 

 Fig. 26. Outline of spermiducal funnel. 

 Fig. 27. Penial bulb in transverse section of the worm. 

 Fig. 28. Outline of spermatheca. 



Marionina forbcsce 



Fig. 29. Outline of anterior end, lateral view. 

 Fig. ;!0. Lymphocytes. 



Plate CII 



Marionina forbcsce — cont. 

 Fig. 31. Seta bundle. 

 Fig. 32. Outline of brain, dorsal view. 

 Fig. 33. Outline of nephridiurr.. 



Fig. 34. Penial bulb in a transverse section of the worm. 

 Fig. 35. Outline of spermatheca. 



