PLATE CXXXVII. 
Fre. 
1. Foot of Harmuthoe marphysx, var. Watsoni, McI. x 1-in. Beck. 
la. Scale. x 1-in. Beck. 
1%. Ventral bristle. 250 diam. 
2. Tip of bristle of Hulalia pusilla, Hirst. x oc. 4, obj. D. 
3. Third foot of Streptosyllis bidentata, Southern (after Southern). x 330. 
4, Thirteenth foot of Opisthodonta pterocheta, Southern (after Southern). x 160. 
5. Head and anterior region of Husyllis lamelligera, De St. Joseph (after De St. Joseph). 
Enlarged. 
5a and 5a’. Tips of bristles. Enlarged. 
6. Head and anterior region of Autolytus lugens, De St. Joseph (after De St. Joseph). 
Enlarged. 
7. Macrocheta clavicornis, Sars, from a_ spirit-preparation sent by Mr. Southern. 
Knlarged. 
8. Anterior end of Armandia flagellifera, Southern (after Southern). x 40. 
8a. The same with the proboscis extruded (after Southern). x 40. 
84. Lateral view of the posterior end (after Southern). x 40. 
9. Cirratulus incertus, Mel. (olim C. bioculatus). Enlarged. 
10. Bristle of Spiochetopterus typicus, Sars, Loch Linnhe. X oc. 4, obj. D. 
10a. Hook. X oc. 4, obj. D. 
11. Hook of Amphitrite, C. (near figulus). x 360. 
12. Tip of branchial filament of Myaicola exsthetica, Claparéde. Enlarged. 
12a. Anterior hook. X oc. 4, obj. D, with 2-in. draw-tube. 
126. Posterior hook. x oc. 4, obj. D, with 2-in. draw-tube. 
13. Caudal bristle of Sabella, W., Jersey. x oc. 4, obj. D. 
14. Posterior hook of Potamilla Torelli, Malmgren. X oc. 4, obj. D. 
15. Anterior hook of Huchone rubrocincta, Sars. xX 360. 
15a. Posterior hook. x 360. 
16. Hook of Amphicora fabricia, O. F. M., under pressure. x oc. 4, obj. F, with full 
draw-tube. 
17. Winged anterior bristle of Placostegus tridentatus, J. C. Fab. x oc. 4, obj. D. 
17a. Bristle from tip of tail. xX oc. 4, obj. D, with 2-in. draw-tube. 
18. Posterior bristle of Pomatocerus actinoceros, Grube. xX oc. 4, obj. D. 
19. Hook of Apomatus ampulliferus, Pil. x oc. 4, obj. F. 
20. Collar-bristle of ilograna unplera, Berkeley. x oc. 4, obj. F, with draw-tube. 
20a. Sickle-like bristle. x 360. 
206. Caudal bristle. > 360. 
20c. Hook. xX 4650. 
21. Collar-bristle of “Salmacina incrustans,’ Clap. x 360. 
22. Collar-bristle of Spirorbis granulatus, L. x oc. 4, obj. F. 
23. Tip of a collar-bristle of Spirorbis Pagenstechert, De Quatrefages. x oc. 4, obj. D. 
