PLATE XVa. 
Fig. 1. Bristle of Phyllodoce duplex, . . . . . x 800. 
Fig. 2. Bristle of Genetyllis (?) oculata. Viewed somewhat antero- 
posterioriy, . . . . . . . x 350. 
Fig. 3. Another of the same seen laterally, . . . . x 350. 
Fig. 4. Bristle of Greeffia oahuensis, ..... x 430. 
Fig. 5. Dorsal bristle of Dalhousia atlantica, . . . . x 50. 
Fig. 6. One of the longer (superior) ventral bristles of the same, . . x 90. 
Fig. 7. One of the forms with shorter tips, . . . . x 210. 
Fig. 8. One of the posterior bristles (with short tip) of a fragmentary 
Hesione, from St. Thomas’s, West Indies, . . . x 400. 
Fig. 9. Another with a longer extremity, ..... x 400. 
Fig. 10. Average bristle of Hesione (Fallacia) pantherina, . . . x 400. 
Fig. 11. Simple solitary bristle of Salvator ia kerguelensis, . . . x 400. 
Fig. 12. Jointed inferior bristle of the same, . . . . x 400. 
Fig. 13. Ono, oi t\\Q,\oagQThxis,t\&s, oi Eusyllis kerguelensis, . . x 400. 
Fig. 14. Bristle of Syllis gigantea, . . ... . . x 250. 
Fig. 15. Bristle of Autolytus maclearanus, ..... x 400. 
Fig. 16. Setigerous process of one of the feet, with the bristles of Syllis 
setuhalensis, ....... x 400. 
Fig. 17. Setigerous process of a posterior foot of the foregoing, with the 
bristles, ....... x 400. 
Fio;. 18. Setio^erous lobe of the anterior region of an attached female bud of 
Syllis ramosa (13 on the Plate by mistake), . . . x 400. 
Fig. 19. Tip of one of the broad flattened translucent bristles in a free 
female bud of the same, ..... x 400. 
Fig. 20. Setigerous region of one of the anterior feet of Syllis hrasiliensis, . x 400. 
Fig. 21. Upper bristle of Syllis capensis, ..... x 400. 
Fig. 22. Bristle of Sphcerosyllis kerguelensis, . . . . x 400. 
