112 ILLINOIS BIOLOGICAL MONOGRAPHS [112 



DESCRIPTION OF PLATE 



Figs. 68-70. — Cercaria glandulosa; consecutive frontal sections, giving details of the nervous 

 system anterior to the brain. X 540. 



Fig. 71. — Cercaria glandulosa; frontal section, with details of innervation of acetabulum. 

 X540. 



Fig. 72-75. — Cercaria glandulosa; tra.nsvQrse sectXons thxn levels aa to dd of Fig. 60. X 540. 



Fig. 76. — Cercaria diaphana; ventral view, considerably flattened by cover slip. X 170. 



Fig. 77. — Cercaria diaphana; ventral view of stylet. X 540. 



Fig. 78. — Cercaria diaphana; ventral view, giving details of glands and genital cell masses. 

 X 170. 



Figs. 79, 80. — Cercaria diaphana; sporocysts. X SO. 



Fig. 81. — Cercaria dendritica; ventral view. X 170. 



Figs. 82, 83. — Cercaria dendritica; lateral and ventral views of stylet. X 250. 



Fig. 84. — Cercaria dendritica; encysted worm. X 150. 



Fig. 85. — Cercaria dendritica; salivary and cystogenous glands. X 170. 



Fig. 86. — Cercaria dendritica; genital system. X 150. 



Fig. 87. — Cercaria dendritica; young sporocyst. X 150. 



Fig. 88. — Cercaria dendritica; mature sporocyst. X 150. 



Fig. 89. — Cercaria dendritica; posterior end of mature sporocyst, showing origin of germ- 

 balls from localized germinal epithelium. X 330. 



