82 ILLINOIS BIOLOGICAL MONOGRAPHS [528 



EXPLANATION OF PLATE 



Fig. 44. Immature relia of Cercaria reflexae. X 88. 



Fig. 45. Mature redia of Cercaria reflexae. X 44. 



Fig. 46. Nervous system of immature redia of Cercaria reflexae. X 276. 



Fig. 47 and 49. Stylet of Cercaria trigonura, side view and ventral view. X 433. 



Fig. 48 and 50. Cercaria trigonura, side view and ventral view. X 195. 



Fig. 51. Very immature redia of Cercaria trigonura. X 195. 



Figs. 52 and 53. Rediae of Cercaria trigonura, containing germ balls. X 140. 



Fig. 54. Cross section of Cercaria trigonura in region of acetabulum. X 433. 



