332 ILLINOIS BIOLOGICAL MONOGRAPHS [332 



EXPLANATION OF PLATE 



Fig. 78. — Proteocephalus torulosus (Batsch), ripe proglottid, frontal section 

 showing small part of uterus and ovary, testes covering almost the entire area 

 between vitellaria. 



Fig. 79. — Proteocephalus torulosus (Batsch), ripe proglottid, frontal section 

 showing relatively large size of ovary and the small number of uterine pouches. 



Fig. 80. — Proteocephalus torulosus (Batsch), ripe proglottid, cross-section in 

 region of cirrus-pouch. 



Fig. 81. — Proteocephalus neglectus La Rue, ripe proglottids, toto, showing re- 

 productive organs. The cirrus-pouch is much shortened, some ducts omitted. 

 Ventral view. 



Fig. 82. — Proteocephalus neglectus La Rue, cirrus-pouch and vagina, normal 

 position and shape. Funnel-like atrium possibly a little exaggerated. Note the 

 muscle fibers at end of cirrus-pouch. 



Fig. 83. — Proteocephalus singularis La Rue, ripe proglottid, frontal section 

 showing uterine pouches and the cut parts of the much coiled excretory ducts. 



Fig. 84. — Proteocephalus singularis La Rue, cirrus-pouch and vagina, recon- 

 struction. Note position of vaginal sphincter and of the dilated portion of the 

 vagina. 



Fig. 85. — Proteocephalus singularis La Rue, ripe proglottid, frontal section 

 showing arrangement of testes, vitellaria and ovary. Vagina and cirrus-pouch not 

 shown. 



Fig. 86. — Proteocephalus singularis La Rue, head, frontal section showing ap- 

 pearance and position of transverse and longitudinal muscles. 



Fig. 87. — Proteocephalus singularis La Rue, head, frontal section showing 

 attachments of longitudinal muscles to the suckers. Scale should read 0.2 mm. 



Fig. 88. — Proteocephalus pinguis La Rue, proglottid, portion of cross-section 

 showing relation of vagina, cirrus-pouch and excretory ducts. 



Fig. 89. — Proteocephalus pinguis La Rue, ventral uterine pores leading to 

 exterior. Shown in frontal section of proglottid just below cuticula. 



