634 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Aonides dlverapoda. 



Fig. 9. Portion of anterior end X 15. 



10. End of heavy seta from second setigerous somite X 350. 



11. Spinous ventral seta from third setigerous somite X 350. 



12. Spinous ventral seta from fourth setigerous somite X 350. 



Melinna dubita. 



13. Ventral view of anterior end X 5. 



14. Dorsal view of anterior end X 5. 



15. Uncinus from thirteenth somite X 350. 



16. Seta from second somite X 350. 



Plate 52. 

 Stylaroides a tentacula. 



Fig. 1. Side view of anterior end X 5. 



2. Anterior capillary seta X 350. 



3. End of dorsal posterior seta X 350. 



4. End of ventral posterior seta X 350. 



Sabella (Branchiomma) acrophthalmos. 



5. Avicular uncinus X 350. 



6. Pennoned seta X 350. 



Sabella secusolutus. 



7. Dorsal view of anterior end X6. 



8. Ventral view of anterior end X 6. 



9. Capillary seta of Type I from third setigerous somite X 350. 



10. Capillary seta of Type II from third setigerous somite X 350. 



11. Avicular uncinus from third setigerous somite X 350. 



12. Pennoned seta from third setigerous somite X 350. 



13. Abdominal seta X 350. 



Tetreres treadwelli. 



14. Dorsal view of anterior end X 6. 



15. Ventral view of anterior end X 6. 



16. Termination of median palea X 350. 



17. Termination of outer palea X 350. 



18. Lateral view of anterior end X 6. 



19. Seta from buccal fascicle X 350. 



20. Anterior ventral seta X 350. 



21. Anterior ventral seta alternating with the foregoing X 350. 



22. Anterior uncinus (only one row of teeth shown) X 350. 



23. Spinous ventral seta from abdomen X 350. 



