96 ILLINOIS BIOLOGICAL MONOGRAPHS [446 



EXPLANATION OF PLATE 



Figures 41 to 43. Moniesia expansa. 



Fig. 41. Mature proglottid, dorsal view; shell gland and part of testes and 

 genital ducts omitted from right side of proglottid. 



Fig. 42. Uterus as it appears just prior to the entrance of the eggs, a compli- 

 cated network of interconnecting small tubes. 



Fig. 43. Uterus in its final stages, a system of separated or nearly separated 

 compartments. 



Figure 44. Cittotaenia variabilis. Proglottid at sexual maturity, dorsal view ; 

 parts of genital ducts and female glands omitted from left side. 

 Figure 45. Cittotaenia pectinata americana. Proglottid at sexual maturity, dor- 

 sal view. 

 Figures 46 to 49. Cittotaenia perplexa from Sylvilagus floridanus alacer, Oklahoma. 



Fig. 46. One-half of proglottid at sexual maturity. The cirrus pouch is here 

 shown to reach across both excretory ducts: usually it reaches just to the lateral 

 nerve trunk. In other specimens at hand the testes are somewhat more numerous 

 in the median part of the field, and less numerous in the lateral parts. In Stiles' 

 figures they are wholly absent from the median part of the field. 



Figures 47 to 49. Cirrus, pouches, showing variations in size and form. All 

 drawn to the same scale. 



