90 ILLINOIS BIOLOGICAL MONOGRAPHS [440 



EXPLANATION OF PLATE 



Figures 22 to 24. Anoplocephala variabilis (see also Plate II). 



Fig. 22. Mature proglottid^ in contracted condition; some structures omitted. 



Fig. 23. Mature proglottid in expanded condition. 



Fig. 24. Vitelline gland, shell gland, and female ducts ; expanded condition, 

 ventral view. 

 Figures 25 to 27. Anoplocephala infrequent. 



Fig. 25. Mature proglottids in ventral view, some structures omitted. The 

 transverse comissures of the ventral ducts which appear straight 

 here are sinuous in dorsoventral plane. 



Fig. 26. Section through the scolex. 



Fig. 27. Vitelline gland, shell gland, and female ducts; ventral view. 



