PLATE XXXIa. 
Fig. 1, Upper thoracic bristle of Dasychone wyvillei, . . . x 210. 
Fig. 2. Inferior bristle of the same process, . . . . x 210. 
Fig. 3. Anterior hook, from a large example of the foregoing, . . x 390. 
Fig. 4. Superior thoracic bristle of Dasychone nigro-maculata, . . x 210. 
Fig. 5. Inferior bristle, from the same foot, . . . . x 210. 
Fig. 6. Anterior hook of the foregoing species, . . . . x 390. 
Fig. 7. Bristle (of average form), from the anterior region of Dasychone 
violacea, ....... x 210. 
Fig. 8. Anterior hook of the same, ..... x 390. 
Fig. 9. One of the upper (not uppermost) bristles of the thoracic region of 
Dasychone hubrechti, . . . . . x 210. 
Fig. 10. Inferior bristle, from the same region, . . . . x 210. 
Fig. 11. Anterior hook of the foregoing, ..... x 390. 
Fig. 12. Thoracic ventral bristle of Protula capensis, . . . x 350. 
Fig. 13. Anterior hook of the species, ..... x 700. 
Fig. 14. One of the longer thoracic bristles of Serpula sombreriana, . x 430. 
Fig. 15. Anterior hook of the same, ..... x 700. 
Fig. 16. Anterior hook of Protula lusitanica, . . . . x 700. 
Fig. 17. Thoracic bristle of Protula arafurensis, . . . . x 350. 
Fig. 18. Anterior hook of the foregoing, ..... x 700. 
Fig. 19. Anteriov hvistle oi Protula americana, . . . . x 210. 
Fig. 20. Hook, from the same region, ..... x 700. 
Fig. 21. Thoracic bristle of Apomatus elisabethce, . . . . x 210. 
Fig. 22. Anterior hook of the foregoing, ..... x 700. 
Fig. 23. Anterior: hAAle oi Serpula narconensis, . . . . x 114. 
Fig. 24. Tip of bristle, from the thoracic region of Serpula narconensis, 
var. magellanica, . . . . . . x 210. 
Fig. 25. Anterior hook of the foregoing, ..... x 430. 
Fig. 26. Tip of an anterior bristle of Pomatocerus strigiceps, . . x 210. 
Fig. 27. Tip of a posterior bristle of the same, . . . . x 350. 
Fig. 28. Anterior hook of the species, . . . . . x 430. 
