94 ILLINOIS BIOLOGICAL MONOGRAPHS [444 



EXPLANATION OF PLATE 



Figures 33 to 40. Schisotaenia anoplocephaloides. 



Fig. 33. Proglottid just before sexual maturity, dorsal view ; uterus and vas 

 deferens omitted. 



Fig. 34. Proglottid at sexual maturity. Ovary and testes omitted. Uterus 

 dotted. 



Fig. 35. Drawing to show the testes extending across the median field, the 

 usual condition in the species. 



Fig. 36. Ripe proglottid, showing fully developed uterus with short anterior 

 and posterior outpocketings. 



Fig. 37. Section of scolex thru suckers. 



Fig. 38. Scolex and anterior regions from toto mount 



Fig. 39. Fully developed uterine embryo, middle embryonic membrane omit- 

 ted. 



. Fig. 4a Diagram to show excretory system in a series of proglottids. Drawn 

 ventral side uppermost. 



