Plate I. 



Dactylogyrus inversus. 



1. Seinidiagrammatic representation of an entire worm killed under the pressure 

 of a cover slip ; dorsal view. 



2. Sagittal section through the body, showing the relative positions of the 

 different organs. 



3. a. Central hooks and connective, with attached muscles, b. Two marginal 

 hooks. X290. 



4. A post-testicular gland cell. x600. 



5. A caudal gland cell. x600. 



6. Keproductive organs in dorsal view. x200. 



7. Posterior prostate gland cells. x600. 



8. Anterior prostate gland cells. XGOO. 



9. a. Ootype in cross section, b. Uterus in cross section. x290. 

 10. Glands of Mehlis. X600. 



