34^ ILLINOIS BIOLOGICAL MONOGRAPHS [346 



EXPLANATION OF PLATE 



Fig. i66. — Proteocephalus tnalopteruri (Fritsch), ripe proglottid. Modified 

 from Fritsch's figure. 



Fig. 167. — Proteocephalus longicollis (Zeder), ripe proglottid. Modified from 

 drawing by von Linstow. 



Fig. 168. — Proteocephalus longicollis (Zeder), ripe proglottid, cross-section. 

 After von Linstow. Note that the testes lie in more than one layer. 



Fig. 169. — Proteocephalus longicollis (Zeder), cirrus-pouch. After von Lin- 

 stow. 



Fig. 170. — Proteocephalus fallax La Rue, outline of proglottids from anterior 

 and posterior parts of strobila. After Kramer. 



Fig. 171. — Proteocephalus iiiacrocephalus (Creplin)=:7"a<r«xo dilatata Linton, 

 folds of tissue along neck. Afty Linton. 



Fig. 172. — Proteocephalus percae (Miiller), piece of strobila. Reproduction of 

 Miiller's figure 4. 



Fig. 173. — Proteocephalus percae (Miiller), strobila. Reproduction of MuUer's 

 figure I. 



