330 ILLINOIS BIOLOGICAL MONOGRAPHS [330 



EXPLANATION OF PLATE 



Fig. 69. — Proteocephalus percae (Miiller), ripe proglottid, toto, ventral view. 

 From one of Schneider's slides. 



Fig. 70. — Proteocephalus percae (Aliiller), ripe proglottid, toto, dorsal view. 

 Testes omitted to show uterine pouches. From one of Schneider's slides. 



Fig. 71. — Proteocephalus percae (Miiller), ripe proglottid, partial reconstruc- 

 tion from ventral sid^ showing relation of reproductive organs. From lot 10.123 

 Ward Collection. 



Fig. 72. — Proteocephalus percae (Miiller), ripe proglottid, toto. Uterine 

 pouches omitted. From lot 10.123 Ward Collection. 



Fig. 73. — Proteocephalus percae (Miiller), fifth sucker, section showing struc- 

 ture. From lot 10.122 Ward Collection. 



Fig. 74. — Proteocephalus percae (Miiller), ripe proglottid, partial reconstruc- 

 tion of cross-sections to show relationship of organs in region of cirrus-pouch as 

 seen from anterior end. From lot 10.122 Ward Collection. The letters va at the 

 extreme right of the figure should read vas. 



Fig. 75. — Proteocephalus dubius La Rue, ripe proglottid, toto showing uterine 

 pouches and shape of decadent ovary. Scale is in error, each unit equals o.i mm. 



Fig. 77. — Proteocephalus dubius La Rue, mature proglottid, toto. 



