336 ILLINOIS BIOLOGICAL MONOGRAPHS [336 



EXPLANATION OF PLATE 



Fig. 97. — Ophiotacnia grandis La Rue, cirrus-pouch and vagina, cirrus partly 

 protruded. 



Fig. 98. — Ophiotaenia grandis La Rue, cirrus-pouch and vagina, cirrus partly 

 protruded. 



Fig. 99. — Ophiotaenia grandis La Rue, organs of interovarial space as seen 

 in an in toto preparation. 



Fig. 100. — Ophiotaenia grandis l^z Rue, two proglottids showing indentation at 

 the genital pore. No genital atrium visible. 



Fig. 101. — Ophiotaenia grandis La Rue, mature proglottid, toto, ventral view 

 showing reproductive organs and ventral uterine pores. 



Fig. 102. — Ophiotacnia perspicua La Rue, ripe proglottid, toto showing uterine 

 pouches. 



Fig. 103. — Ophiotaenia filaroides La Rue, ripe proglottid, showing uterine 

 pouches and protruded cirrus. 



Fig. 104. — Ophiotaenia filaroides La Rue, organs of interovarial space from 

 a reconstruction. After La Rue 1909. Through an error in lettering the lower 

 part of the vagina is marked 'od' whereas the fertilization passage beneath the 

 vagina should be marked 'od'. 'Ys' should read 'rs'. 



Fig. 105. — Ophiotaenia filaroides La Rue, mature proglottid, toto, unflat- 

 tened, showing relationships of organs. After La Rue 1909. 



