PLATE CXXXI. 
Fic. 
land 1’. Anterior bristles of Chone filicuudata, Southern. x oc. 4, obj. D, with 1-in. 
draw-tube. 
la. Long anterior hook. xX oc. 4, obj. D, with 1-in. draw-tube. 
1b. Posterior hook. x oc. 4, obj. F. 
2 and 2’. Anterior bristles of Huchone rubrocincta, Sars. oc. 4, obj. D, with 1-in. 
draw-tube. 
2a. Long anterior hook. X oe. 4, obj. D, with 1-in. draw-tube. 
3. Anterior hook of Serpula vernicularis, L. x oc. 4, obj. D, with 2-in. draw-tube. 
3a. Posterior hook. X oe. 4, obj. D. 
4. Curved bristle of Amphiglena mediterranea, Leydig, with short wings. 
4a. Another of the same type seen antero-posteriorly. xX oc. 4, obj. F. 
4b. A form with broader wings (spatulate). x oc. 4, obj. D, with 2-in. draw-tube. 
4c and 4d. Minute bristles (with the tip bent) accompanying the anterior hooks. 
x oc. 4, obj. F. 
4.e. Anterior hook. x oc. 4, obj. F. 
47. Posterior hook. x oc. 4, obj. D, with full draw-tube. 
5. Tip of branchial filament of Chone Reayi, Mcl. Enlarged. 
6. Anterior bristle with a trace of wings from Muchone rubrocincta, var. Normani, Mel. 
x oc. 4, obj. D. 
6a. Stouter form with serrated wings. X oc. 4, obj. D. 
6b. Long anterior hook. X oc. 4, obj. F, with 1-in. draw-tube. 
6c. Posterior hook. xX oc. 4, obj. D, with 23-in. draw-tube. 
6d. Posterior bristle with slender tip and narrow wings. X oc. 4, obj. D. 
7 and 7a. Slightly serrated winged bristle of Pomatocerus triqueter, Li.  X oc. 4, 
obj. D, with full draw-tube. 
7b and 7b’. Posterior brush-shaped bristles. x oc. 4, obj. F, and oc. 4, obj. D. 
7c. Anterior hook. xX oe. 4, obj. D, with draw-tube. 
7d. Posterior hook. x oc. 2, obj. F, with draw-tube. 
8. Shehtly winged anterior bristle of Plucostequs tridentatus, J. C. Fabricius. oe. 4, 
obj. D. 
8a. Anterior hook. x oc. 4, obj. F. 
9. Anterior slightly winged bristle of variety of Placostegus tridentatus, Fabr. 
x oc. 4, obj. D, with 1l-in. draw-tube. 
9a. Tip of branchial filament. Enlarged. 
9b. Anterior hook. x 500 diam. 
10. Tip of branchial filament of Hydroules norvegica, Gunner. Hnlarged. 
11. Operculum of var. of Placostegus tridentatus, Fabr., from the “Porcupine.” Enlarged. 
