116 ILLINOIS BIOLOGICAL MONOGRAPHS 236 



EXPLANATION OF PLATE 



Paragordius varius 



Fig. 164.— Section thru posterior end of adult male; cloacal ganglion and circular muscles 



surrounding the sperm ducts; X 275. 

 Fig. 165. — Longitudinal section thru posterior end of young parasite; shows invaginated 



ectoderm forming intestinal diverticula; X 500. 

 Fig. 166. — Cross section thru anterior region of specimen with adult cuticula nearly complete; 



shows cellular projections into cuticula; X 275. 

 Fig. 167.— Cross section of female with adult cuticula nearly formed; cellular projections and 



formation of areolae; X 500. 

 Fig. 168. — Sagittal section thru upper end of cloaca of female; X 100. 

 Fig. 169. — Early stage in formation of cuticula; areolae very small; X 500. 



