SEPIA 



9. View of radula and its sheath from the side, obtained by removing the jaws and dissecting 

 away the muscles of the buccal mass. Radula ; sheath of radula ; oesophagus. 



10. Spermatophore under low power; spermatocysts ; spiral spring. 



11. Transverse section of an eye. Cornea; iris; lens; its ciliary attachments; retina; optic ganglion; 

 optic nerve. 



82 



