212 



Fridericia douglasensis 



Fig. 25. Diagram of the chief blood vessels in anterior region. 

 Fig. 26. Superficial section of the clitellar cells. 



Plate X 



Fridericia douglasensis — cont. 



Fig. 27. Outline of nephridium. 



Fig. 28. Spermatheca. 



Fig. 29. Spermiducal funnel. 



Fig. 30. Seta. 



Fig. 31. Outline of brain, dorsal view. 



Fig. 32. Penial bulb in a transverse section of the worm. 



Fig. 33. Part of longitudinal section of intestine in chylus cell region. 



Fig. 34. Peptonephridium. 



Fridericia oconeensis 



Fig. 35. Outline of brain, dorsal view. 

 Fig. 36. Outline of nephridium. 

 Fig. 27- Spermatheca. 



Plate XI 



Fridericia oconeensis — cont. 



Fig. 38. Part of transverse section through intestine in chylus cell region. 



Fig. 39. Peptonephridium. 



Fig. 40. Spermiducal funnel. 



Fig. 41. Transverse section through intestine in chylus cell region. 



Fig. 42. Penial bulb in a transverse section of the worm. 



Fridericia sima 



Fig. 43. Peptonephridium. 



Fig. 44. Outline of nephridium. 



Fig. 45. Outline of nephridium of another form. 



Fig. 46. Part of transverse section through intestine in chylus cell region. 



Fig. 47. Outline of anterior end. 



Fig. 48. Outline of brain, dorsal view. 



Fig. 49. Outline of longitudinal section through spermiducal funnel. 



Plate XII 



Fridericia sUna — cont. 

 Fig. 50. Spermatheca. 

 Fig. 51. Penial bulb i.i a transverse section of the worm. 



Enchytrceus gillettensis 



Fig. 52. Outline of brain, dorsal view. 



Fig. 53. Outline of longitudinal section through spermatheca. 



Fig. 54. Outline of nephridium. 



Fig. 55. Outline of spermiducal funnel. 



Fig. 56. Penial bulb in a transverse section of the worm. 



Henlea urbanensis 

 Fig. 57. Spermatheca. 



Fig. 58. Penial bulb in a transverse section of the worm. 

 Fig. 59. Intestinal diverticulum in a transverse section of the worm. 



