Plate XXII. 



Tbistomum sinuatum. 



Fig. 1. A small portion of a liorizontal section of the body near the terminal portion 

 of the vas deferens, x 204 diam. To show the prostate glands. 



„ 2. A small portion of a horizontal section of the body near the genital open- 

 ing. X 50 diam. 



„ S. Horizontal section through the ootyp and the adjoining parts. x 204 

 diam. 



„ 4. Snbmedian section of the penis ; from a horizontal section of the body. 

 X 204 diam. 



,, 5. A small ventral portion of a cross-section of the body through the yolk- 

 reservoir. X 204 diam. 



„ 6. A section through the right, hinder eye-spot and the adjoining parts of the 

 brain, x 427 diam. 



