PLATH CXXXVI. 
Fie. 
1. Dorsal bristle of Chrysopetalum debile, Grube, from Clew Bay. X oc. 4, obj. D. 
2. Head and anterior region of Phole tuberculatu, Southern. Enlarged. 
3. Dorsal bristle of Paraonis lyra, Southern. x oc. 4, obj. D. 
4. Bristle of Spherodorwm claparedu, Greef. x oc. 4, obj. F, with full draw-tube. 
5 and 5a. Bristles of Spherodorum minutiuin, Webster & Benedict. x oc. 4, obj. F. 
6. Anterior foot of Nerinides longirostris, De Quatrefages. xX oc. 2, obj. A. 
6a. Dorsal bristle of the same. X oc. 4, obj. D, with full draw-tube. 
7. Tenth foot of Nerinides tridentata, Southern. x oc. 2, obj. A. 
8. Anterior foot of Aonides paucibranchiata, Southern. x oc. 2, obj. A. 
Saand 8a’. Dorsal bristles of the same. X oc. 4, obj. D, with full draw-tube. 
9. Dorsal bristle of Polydora ceca, Girsted. x oc. 4, obj. F. 
10. Curved dorsal bristle of Pygospio seticornis, Girsted. x oc. 4, obj. F. 
10. Dorsal bristle of a more slender type. oc. 4, obj. F. 
10. Bristle from the caudal region of the same with enlarged tip. X oc. 4, obj. F. 
11. Hook of Magelona rosea, Moore. xX oc. 4, obj. F. 
12. Tooth-like bristle of the fourth segment of Phyllochetopterus anglicus, Potts. oc. 4, 
obj. D. 
12a. Translucent hook from the posterior region of the same. x 200. 
13. Dorsal bristle of Chetozone killariensis, Southern. X oc. 4, obj. F, with 2-in. draw- 
tube. 
14. Dorsal bristle of Macrocheta clavicoriis, Sars. oc. 4, obj. D. 
14a. Anterior hook. x oc. 4, obj. D. 
14%. Posterior hook. x oc. 4, obj. D. 
15. Hook of Chetozone alata, Southern. x oc. 4, obj. A. 
16. Hook of Notomastus rubicundus, Keferstein. oc. 4, obj. F. 
17. Dorsal bristle of Petaloproctus terricola, De Quatrefages. x oc. 2, obj. D. 
iia. Spine  >qocs 2) objs D: 
17b. Hook. xX oc. 4, obj. D. 
18. Outline of Micromaldane ornithocheta, Mesnil, from a spirit-preparation. Hnlarged. 
18a. Dorsal bristle. x oc. 4, obj. F, with full draw-tube. 
186. Hook. xX oc. 4, obj. F, with full draw-tube. 
19. Tube of Terebellid with long sponge-spicules. ‘* Porcupine,” 1870, in 690 fathoms, 
Atlantic. Shghtly enlarged. 
20. Hook of Spirorbis violaceus, Levinsen, var. Caulleryi, Mcl. Viewed somewhat obliquely. 
x oc. 4, obj. F. 
21. Anterior ventral region of Lagis korem, Malmgren, showing the nuchal organs, 1. 
From a photograph by Mr. Arnold Watson. Enlarged. 
22. Section through the chordoid anterior region of Bispira volutacornis, Montagu. 
br. v., branchial vessel; c., glandular tissue of collar; ch., chordoid tissue; m., mouth. 
23. Anterior bristle of Hydroides norvegica, Gunner. xX 360. 
