632 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Nereis (Heterone'reis) caeruleis. 



Fig. 13. Dorsal view of head X 13. 



l-l. Conventional dorsal view of pharynx X 10. 



15. Conventional ventral view of pharynx X 10. 



16. Thirteenth lefl parapodium X 25. 



Plate 48. 

 Nereis (Hetcronereis) caeruleis. 



Fig. 1. Anterior view of fifty-second right parapodium X 16. 



u. Natatory seta from fifty-second right parapodium X 350. 



3. Setose seta from fifty-second right parapodium X 350. 



4. Falcate seta from thirteenth right parapodium X 350. 



Nephthys mirasetip. 



5. DOrsal view of head and proboscis X 13. 



6. Posterior view of fifty-sixth parapodium X 26. 



7. Barred seta X 350. 



8. Bidentate serrated seta X 350. 



Euphrosyne tripartita. 



9. Dorsal view of caruncle and tentacle X 26. 

 lit. Typical gill X 30. 



11. Ventral seta X 350. 



12. Dorsal seta X 350. 



Hermodice distincta. 



!.">. Dorsal view of head and caruncle X 10. 



14. Anterior view of sixteenth right parapodium X 9. 



15. Dorsal seta X 350. 



Notopygus lii*i>i<l<i. 



16. Dorsal view of head and caruncle X 10. 



Plate 49. 



Notopygus hispida. 



Fig. 1. Posterior view of right eighth parapodium X 12. 

 •_'. Simple dorsal seta X 55. 

 ;:. Bifid ventral seta X 55. 



Marphysa digitibranchia. 



4. Dorsal view of head X 20. 



5. Dorsal view of jaw apparatus X 41. 



6. Ventral view of left mandible X 47. 



7. Anterior view of right seventeenth parapodium X 50. 

 s. Posterior view of left eightieth parapodium X 50. 



9. Dorsal seta X 350. 



10. Ventral seta Type I X 350. 



11. Ventral seta Type II X 350. 



12. Ventral seta Type III X 350. 



13. Blunt aciculum X 350. 



14. Toothed aciculum X 350. 



