PLATE CVIL 



Fig. 



1. Finely serrated dorsal bristle of Cirratulus tentacul at/us, Montagu. X oc. 4, obj. D. 



1 a. Hook of the same. X oc. 4, obj. D. 



2. Dorsal bristle of Cirratulus cirratus, 0. F. Midler. X oc. 4, obj D. 



2 a. Curved and serrated bristle of the same. X oc. 4, obj. D. 



2 b. Smaller and more curved (less worn) ventral hook. x oc. 2, obj. D, with draw- 

 tube. 

 2 c. Larger hook of the same. X oc. 2, obj. D, with 1 in. draw-tube. 



3. Hook of Cirratulus Chiaji, Mel. x oc. 4, obj. F. 



4. Dorsal bristle of Ghsetozone setosa, Malmgren. x oc. 2, obj. F. 



5. Dorsal bristle of Chsetozone zetlandica, Mel. X oc. 2, obj. F. 

 5 a. Ventral hook of the same. X oc. 2, obj. D. 



7 and 7 a. Average examples of the tips of the ventral bristles of Dodecaceria concharum. 



See 'Ann. Nat. Hist.,' ser. 4, vol. ii, p. 286. x 350. 

 7 b. Entire hook. X oc. 2, obj. D. 

 7 c. Anterior hook. X oc. 2, obj. D. 

 7 d. Posterior hook in which the spoon-like cavity at the tip is longer. x oc. 2, obj. F. 



7 e. Anterior bristle. X oc. 4, obj. F. 



8. Dorsal bristle of Heterocirrus ater, De Quatrefages. X oc. 2, obj. D. 



8 a. Ventral hook of the same in lateral view, x oc. 2, obj. D. 



8 b. Antero-posterior view. x oc. 2, obj. D. 



9. Dorsal bristle of Notomastus later ice/us, Sars. X oc. 4, obj, D. 



9 a. Hook of the foregoing. X oc. 4, obj. D, with 2 in. draw-tube. 

 9 b. Tip of a hook more highly magnified. x oc. 4, obj. F. 



10. Dorsal bristle of Capitella capitata, 0. Fabricius. X oc. 4, obj. D. 

 10 a. Hook. X oc. 2, obj. F. 



11. Hook of Capitella capitata, Fabr. From the East Hocks, St. Andrews. X oc. 4, 



obj. F. 



12. Hook of Capitella capitata, var. with eyes, from Lochmaddy. X oc. 4, obj. F. 



13 and 13 a. Bristles of variety of Notomastus latericeus, Sars, off Cape Finisterre. 

 ' Porcupine,' 1870. x oc. 2, obj. D. 



13 b. Hook of the same. X oc. 2, obj. D. 



14. Bristle from the seventh foot of Cirratulispio Ca/ulleryi, Mcintosh. x oc. 4, obj. D, 



with full draw -tube. 



14 a. Spine-like bristle from the first segment of the second region of the foregoing. 



X oc. 4, obj. D. 



15. Dorsal bristle from the anterior region of TJasybranchus caduciis, Grube. X oc. 2. 



obj. D. 



15 a. Hook of the foregoing, x oc. 4, obj. F. 



16. Hook of the first foot of Spiophanes bombyx, Claparede. X 224. 



17. Feathery bristle of the twentieth foot from the posterior end of Poecilochdetus serpens, 



Allen. X oc. 4, obj. D. 



18. Hook of Heterocirrus viridis, Langerhans. X oc. 4, obj. D. 



