PLATE XVIIIa. 
Fig. 1. A lateral view of one of the posterior hooks of Lumhriconereis 
japonica, . . . . . . . x 250. 
Fig. 2. One of the winged bristles next the winged hooks in the tenth 
foot of Lumbriconereis hei^guelensis, . . . . x 250. 
Fig. 3. The upper hook of the series in the tenth foot of the same, . x 400. 
Fig. 4. Two of the extremely elongated bristles projecting from the thirtieth 
foot of the foregoing, . . . . . x 90. 
Fig. 5. One of the elongated bristles, from the sixteenth foot of Lumhri- 
conereis neo-zealanicB, var. A, . . . . x 250. 
Fig. 6. Posterior hook of the same, var. A, . . . . x 400. 
Fig. 7. Posterior (and suj>erior) hook of Lumhriconereis neo-zealanice, var. B, x 400. 
Fig. 8. Winged bristle, from the sixteenth segment of the same (var. B), . x 250. 
Fig. 9. The third winged hook (viewed antero-posteriorly) of the tenth 
foot of the foregoing (var. B), . . . . x 250. 
Fig. 10. Posterior hook of Lumhriconereis ahyssorum, . . . x 400. 
Fig. 11. Vo&tQYiox hook oi Lumhriconereis punctata, . . . x 400. 
Fig. 12. Posterior hook of Lumhriconereis ehlersi, var. tenuisetis, . . x 400. 
Fig. 13. An average hook, from the fragmentary example of Lumhrico- 
nereis hetero'poda, . . . . . . x 250. 
Fig. 14. Tip of a bristle (from the group below the dorsal hook) of the 
foregoing, ....... x 250. 
Fig. 15. A posterior bristle of Ahtocfrrits cayjensfs, . . . . x 250. 
Fig. 16. Dorsal bristle, from the thirtieth foot of 5c/marc?6B, . x 400. 
Fig. 17. Jointed bristle, from the thh’tieth foot of the same, . . x 400. 
Fig. 18. Upper brownish spine (with hook and wing), from the fiftieth foot 
of the foregoing, . . . . . . x 400. 
Fig. 19. Brush-like bristle, from the posterior region of the same, . . x 400. 
Fig. 20. One of the stouter bristles, from a fragment of a male specimen of 
Palolo viridis, ...... x 400. 
Fig. 21. A jointed bristle from the same specimen, . . . . x 400. 
