98 ILLINOIS BIOLOGICAL MONOGRAPHS [316 



PLATE V ! 



Fig. 12. Cross section, immature specimen of Notocotylus urbanensis. X 190. ! 



Fig. 13. Spines of Paramonoslomum echinum, front view. X 700. 



Fig. 14. Notocotylus urbanensis, young specimen, partial lateral view. X95. < 



Fig. 15. Paramonostomum echinum, ventral view. X 87. 



Fig. 16. Spines oi Paramonoslonnmi echinum, lateral view. X700. 



Fig. 17. Notocotylus urbanensis, immature stage, ventral view. X150. 



Fig, 18. Notocotylus urbanensis, ventral view. X44. i 



Fig. 19. Notocotylus urbanensis, young specimen, dorsal view. XI 20. \ 



