DOTO, 



Fig. 3. Dorsal view of the buccal mass, 



4. Side view of the tongue. 



5. A portion of the same more highly magnified. 



6. A portion of the same seen from above. 



7. Buccal mass with salivary gland : — a, side view of the buccal mass ; b, oesophagus ; c, 



salivary gland ; d, duct of the same ; e, accessory salivary gland ; f, channel of the 

 mouth. 



8. A portion of the accessory salivary gland more highly magnified. 



9. Two of the sacs of the same, increased in size. 



10. A single sac of the same, still more highly magnified, exhibiting the nucleated cells and 



the vessels ? leading from them (the cells on the under side are not shown.) 



11. Three of the nucleated cells with the vessels attached. 



12. A lateral view of one of the smaller branchial processes, as seen in the compressor of the 



microscope. 



13. A transverse section of one of the larger branchial processes showing the complicated 



structure of the gland : — a, central duct. 



14. A single branch of the same more highly magnified : — a, central duct ; b, b } blood 



passages. 



15. Generative organs. 



16. Cerebral ganglions and nerves : — a, upper ganglions ; b, b, lateral or under ganglions ; 



c, buccal ganglions ; d, d, ganglions of the dorsal tentacles (olfactory ganglions ;) e, e 3 

 eyes; /, /, auditory capsules. 



17. Eye of D. coronata. 



18. Auditory capsule of the same. 



