Plaie XXIV. 



Teistomum ovale. 



Fig. 1. A small portion of the wall of the penis in longitudinal section. x 204 

 diam. 



„ 2. A small ventral portion of a cross-section of the body. x20i. The 

 reference lines for I. mus. and (//V/;/. mus. should reach more inward, the 

 latter to the oblique lines next the cir. mus., and the former to the nume- 

 rous closely crowded dots next the foregoing. 



,, 3. Cross-section of the left anterior eye and its vicinity, x 427 diam. 



„ 4. Cross-section of the left posterior eye. x 427 diam. 



,, 5. Two nerve-cells from the brain, x 427 diam. 



T R I s T M U M R p T U N D U M . 



Fig. G. The whole worm viewed from the ventral side. On the right side the 

 testes are shown only in outline, and the vitellarium is wholly omitted. 

 „ 7. Three chitinous corpuscles from the margin of the body, x 204 diam. 

 „ 8. One of the hooks of the posterior sucker, x 204 diam. 

 „ 9. Central part of the genital organs viewed from the ventral side, x 29 

 diam. 



T R I s T JI U M F L I A C E U M . 



Fig. 10. The whole worm viewed from the ventral side. The vitellarium is not 

 shown on the right side. 

 ,, 11. Hooks of the posterior sucker, x 204 diam. 

 „ 12. Median sagittal section of the anterior part of the body, x 73 diam. 



