PLATE XXVIa. 
Fig. 1, Bifid bristle, from the third foot of Nothria willemoesii, 
Fig. 2. Bristle from the same foot, viewed antero-posteriorly, so as to 
exhibit the “ wing,” ...... 
Fig. 3. Delicate brush-shaped bristle, from the posterior region of the 
foregoing, ....... 
Fig. 4. Bifid hook, from the posterior region of the same, . 
Fig. 5. Bifid bristle, from the first region of Nothria ehlersi, 
Fig. 6. Hook, from the posterior region of the same, 
Fig. 7. Brush-shaped bristle, from the twentieth foot of the foregoing. 
Fig. 8. Bifid bristle, from the first foot of Nothria armandi, 
Fig. 9. Brush-shaped bristle, from the twentieth foot of the same, . 
Fig. 10. Hook, from the fiftieth foot of the foregoing. 
Fig. 11. One of the inner palese of Sahellaria [Pallasia) capensis, . x 
Fig. 12. Hook of the same species (slightly turned). 
Fig. 13. Outer palea of the crown of Sahellaria {Pallasia) australiensis. 
Fig. 14. Tip of one of the inner palese of the same, .... 
Fig. 15. Hook of the foregoing, ...... 
Fig. 16. Winged bristle, from the anterior region of Petta assimilis. The 
figure shows part of both wings, .... 
Fig. 17. Winged bristle of the same, with a delicate limb at the tip. 
Fig. 18. Strong hook-like caudal bristle from the foregoing. 
Fig. 19. Hook of the same form, ...... 
Fig. 20. Paleola (of average size) of Ampharete somhreriana, 
Fig. 21. Uncinus of the same, ...... 
Fig. 22. Paleola from the middle of the group in Ampharete Jcerguelensis, . 
Fig. 23. Tip of a paleola from a smaller specimen of the same species, 
showing the filiform tip and the wing-like process at the margin. 
Fig. 24. Hook of the same, ....... 
Fig. 25. Hook of Phyllocomus croceus, ..... 
Fig. 26. Bristle from the anterior region of Amphicteis gunneri, var. 
atlantica, ....... 
Fig. 27. Hook of the same, ....... 
Fig. 28. Flook of Amphicteis gunneri, from the Gulf of St. Lawrence, 
Canada, . . . . 
Fig. 29. Hook of Amphicteis gunneri, from Shetland, 
X 350. 
X 430. 
X 350. 
X 210. 
X 350. 
X 210. 
X 350. 
X 350. 
X 350. 
X 210. 
about 40. 
X 700. 
X 90. 
X 90. 
X 700. 
X 210. 
X 210. 
X 210. 
X 700. 
X 90. 
X 700. 
X 114. 
X 700. 
X 700. 
X 350. 
X 55. 
X 700. 
X 700. 
X 700. 
