334 ILLINOIS BIOLOGICAL MONOGRAPHS [334 



EXPLANATION OF PLATE 



Fig. 90. — Proteoccphalus pinguis La Rue, cirrus, vagina, vas deferens and 

 portion of vasa efferentia. From a reconstruction. Scale should read 0.1 mm. 



Fig. 91. — Proteoccphalus pinguis La Rue, complex of excretory ducts leading 

 to the dorsal and ventral surfaces of the proglottid. 



Fig. 92. — Proteocephalus pinguis La Rue, ripe proglottid, toto, ventral view. 

 From lot 8, Sebago Lake material. 



Fig. 93- — Proteocephalus pinguis La Rue, head, longitudinal section showing 

 structure of suckers, etc. 



Fig. 94. — Monticellia coryphicephala (Monticelli), ripe proglottid, cross-section 

 showing relations of organs to the muscle-sheath. From one of Monticelli's prep- 

 arations. 



Fig. 95. — Monticellia coryphicephala (Monticelli), ripe proglottid, toto, show- 

 ing peculiar appearance of ovary, distribution of testes over entire field between 

 vitellaria, and the scattered vitelline follicles. From one of Monticelli's prepara- 

 tions. Cf. Fig. 186. 



Fig. 96. — Monticellia coryphicephala (Monticelli), ripe proglottid, cross-section 

 through region of ovary showing peculiar relation of organs to muscle-sheath. 

 Note that the ovary is partly outside and partly inside this sheath. From one of 

 Monticelli's preparations. 



