192 s. GOTO. 



Fig. 19. — The vitelline body, from a longitudinal section of a worm 



collected in September. 

 Fig. 20. — The same, from a cross-section of a worm collected in May; 



the yolk-cells not ripe. 

 Fig. 21. — Section of the ovary near its larger end. 

 Fig. 22. — The same near its smaller end. 

 Fig. 23. — Longitudinal section of the uterus (Eiergang). 

 Fig. 24. — Cross-section of the uterus proper (Ootyp). 

 Fig. 25. — A cross-section of the worm through the region of the 



pharynx ; to shew the peculiar gigantic cells. Zeiss Dx2. 



PI. XXIII. 



An uninterrupted series of sagittal sections of the worm. To 

 the respective abl)revnations is subjoined the letter r or I according as 

 the parts belong to one or the other individual. Zeiss Bx2. 



