388 ^- ^- PEATT, Life-history and Anatomy of tlie Appendiculate Distomes. 



Plate 26. 



Fig. 5. Longitudinal section of the hinder portion of a worm the 

 invaginated appendix of which is covered with an epithelium. The 

 section does not pass through the appendicular pore. The superficial 

 muscles are not shown. X "^60. 



Fig. 6. Longitudinal section of the hinder portion of a worm the 

 invaginated appendix of which is just shedding its epithelium. The 

 section does not pass through the appendicular pore. The superficial 

 muscles are not shown. X ^'^^• 



Fig. 7. Longitudinal section of the hinder portion of a worm the 

 invaginated appendix of which is without an epithelium. The super- 

 ficial muscles are not shown. X ^^0. 



Fig. 8. Cross-section of the hinder end of a worm with appendix 

 invaginated, showing appendicular pore and sphincter muscle. X ""^^O. 



Fig. 9. Cross-section of the body-wall from the middle portion of 

 a worm showing the cuticula and superficial musculature. X 1600. 



Fig. 10. Cross-section of the forward end of the worm showing 

 the oral sucker. X ^^^• 



Plate 27. 



Fig. IL Frontal section of the forward portion of the worm 

 showing relations of the organs. The superficial muscles are not shown. 

 X 520. 



Fig. 12. Sagittal section of the forward portion of the worm 

 showing the terminal portion of the genital vestibule and the genital 

 opening. The superficial muscles are not shown. X 520. 



Fig. 13. Longitudinal section of the forward portion of the worm 

 showing the main portion of the genital vestibide and of the pars pro- 

 statica. The superficial muscles are not shown. X 520. 



Fig. 14. Cross-section of the genital vestibule. X ^"^5. 



