PLATE XXXVII. 



FIG. I. Protula atypha sp. nov., p. 228. Seta from abdomen of specimen from 

 Pacific Grove, California. 



2. Front view of thoracic uncinus apparently without serrations. 



3. Chitinopoma greenlandica (Morch) Levinsen,p. 229. Operculum from 



specimen from Greenland. 



4. Protula atypha sp. nov., p. 228. Side view of another uncinus from 



sixth thoracic torus. 



5. Spirorbis validus Verrill, p. 249. Abdominal seta from specimen from 



Grand Banks. 



6. A simple curved seta from same region. 



7. Collar seta showing imperfection in margin. 



8. Collar seta from another specimen. 



9. Chitinopoma greenlandica (Morch) Levinsen, p. 229. Operculum of 



specimen on tube of Notkria conchylega, from off eastern coast of 

 New England, in 32 fathoms. 



10. Spirorbis validus Verrill, p. 249. Seta from second thoracic fascicle of 



animal from Grand Banks. 



11. Pseudopotamilla oculifera (Leidy), p. 204. Pennoned seta from 



thorax of specimen from Atlantic Ocean. 



12. Sabella elcgans sp. nov., p. 194. Pennoned seta from thorax. 



13. Pseudopotamilla oculifera (Leidy), p. 204. Avicular thoracic uncinus 



from specimen from Atlantic Ocean. 



14. Another, showing slight variation. 



I 5* Spirorbis morchi Levinsen, p. 240. Seta from second thoracic fascicle 

 of specimen from the Banks, Atlantic Ocean, in 110-120 fathoms. 



16. Chone teres sp. nov., p. 215. Seta from first thoracic segment of type, 



about # view. 



17. Seta from abdomen, partly turned. 



18. Bayonet seta from thorax. 



19. Superior thoracic seta below collar. 



20. Inferior thoracic seta below collar. 



21. Hooked thoracic seta from fourth segment. 



22. Abdominal uncinus. 



23. Another, showing variation. 



24. Spirorbis morchi Levinsen, p. 240. Collar seta from same specimen 



as fig. 15. 



25. Spirobranchus incrassatus (Kroyer), p. 236. Thoracic uncinus from 



specimen from Central America. 



26. Eupomatus gracilis sp. nov., p. 234. Thoracic uncinus from specimen 



from Pacific Grove, California. 



27. Abdominal uncinus. 



28. Schizobranchia dubia sp. nov., p. 208. Inferior thoracic seta below 



collar, back view. 



(332) 



