Castle. — Rhjiichobdellidae. 



PLATE 5. 

 G. heteroclita. 



Fig. 19. Dorsal view of a rather small individual. For clearness furrows between 

 annuli are shown only at the margin of the body, except where they 

 mark somite boundaries. Salivary glands are shown only in the right 

 half of the figure, testes only in the left half. From an entire prepara- 

 ration. X 62. 



Fig. 20. Combination of two or three successive parasagittal sections of head end. 

 X 83. 



Fig. 21. Brain viewed from the left side. From several sections combined. 



Fig. 22. Ventral view of a living animal bearing eggs. X about 13, 



\ 



