v] 



TURBELLARU 



95 



1 



3- 



-12 



--2 



11 



10--\\ 



9~\\--/- 



6 



18 



FIG. 41. Mesostoma splendidum, drawn from a compressed individual ; the 

 cilia and rhabdites are omitted. Magnified. From von Graff. 



1. Brain, showing two eyes. 2. Pharynx surrounding the mouth. 3. Food 

 vacuole in an endotlerm cell. 4. Ectoderm. 5. . Testis lying above 

 alimentary canal, showing developing spermatozoa. 6. Muscle fibres. 



7. Genital atrium. 8. Glands of the genital atrium. 9. Penis. 



10. Shell-glands surrounding the spermatheca. 11. Germariurn. 



12. Vitellarium. 



