PLATE XXXIX. 



FIG. i. Crucigera irregularis sp. nov., p. 234. Collar seta from type. 



2. Uncial plate from thorax. 



3. Uncial plate from abdomen. 



4. Seta from abdomen. 



5. Another uncial plate from thorax. 



6. Crucigera formosa sp. nov., p. 233. Uncial plate from thorax of type* 



showing abnormal development. 



7. Abdominal uncinus, front view. 



8. Crucigera zygophora (Johnson), p. 233. Abdominal uncinus. 



9. Spirorbis eximius sp. nov., p. 239. Caudal seta from specimen from 



Pacific Grove, California. 



10. Crucigera formosa sp. nov., p. 233. Collar seta. 



11. Abdominal uncinus. 



12. Crucigera zygophora (Johnson), p. 233. Abdominal seta. 



13. Thoracic uncinus. 



14. Crucigera formosa sp. nov., p. 233. Another uncinus from thorax, 



more normally developed than fig. 6. 



15. Crucigera zygophora (Johnson), p. 233. Another abdominal uncinus. 



16. Spirorbis similis sp. nov., p. 242. Seta from second thoracic fascicle. 



17. Crucigera zygophora (Johnson), p. 233. Collar seta. 



18. Spirorbis formosus sp. nov., p. 251. Collar seta. 



19. Another, from different specimen. 



20. Crucigera zygophora (Johnson), p. 233. Thoracic uncinus, about ^ 



view. 



21. Spirorbis spirillum (Linne") var. lucidus (Montagu), p. 243. Collar 



seta from specimen from Casco Bay. 



22. Capillary seta from thorax of a specimen from Pacific coast. 



23. Collar seta from another specimen from Atlantic coast. 



24. Spirorbis variabilis sp. nov., p. 238. Collar seta. 



25. Another, showing variations in serrations. 



26. Spirorbis marioni Caullery and Mesnil, p. 239. Nearly front view of 



operculum, showing calcareous plate of specimen from Mexico. 



27. Side view of same. 



38. Spirorbis spirillum (Linne) var. lucidus (Montagu), p. 243. Collar 

 seta from specimen from Pacific Grove, California. 



29. Spirorbis lineatus sp. nov., p. 242. Collar seta. 



30. Spirorbis tubtzformis sp. nov., p. 251. Seta from second thoracic 



fascicle of specimen from Long Island Sound. 



31. Spirorbis similis sp. nov., p. 242. Collar seta from immature speci- 



men. 



32. Spirorbis tubceformissp. nov., p. 251. Collar seta from same specimen 



as fig. 30. 



33. Serpula splendens sp. nov., p. 230. Caudal uncinus, front view, much 



enlarged. 



(336) 



