346 ILLINOIS BIOLOGICAL MONOGRAPHS [346 



EXPLANATION OF PLATE 



Fig. 166. — Protcoccphalus maloptcruri (Fritsch), ripe proglottid. Modified 

 from Fritsch's figure. 



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

 drawing by von Linstow. 



Fig. 168. — Protcoccphalus loitgicollis (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. — Protcoccphalus fallax La Rue, outline of proglottids from anterior 

 and posterior parts of strobila. After Kramer. 



Fig. 171. — Protcoccphalus macro cephalus (Creplin) =Taenia dilatata Linton, 

 folds of tissue along neck. After Linton. 



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



Midler's figure 4. 



Fig. 173. — Proteocephalus percae (Muller), strobila. Reproduction of Midler's 

 figure 1. 



