PLATE LXXIX. 



Fig. 



1. Portion of shaft of bristle from the dorsal lobe of OpModromus flexiwsus, D. Chiaje. 



X 750. 

 1 a. Bristle with longest terminal process from the same. X Zeiss oc. 2, obj. F. 



1 b. Bristle with shorter terminal piece. X 700. 



2. Dorsal bristle of Gastalia punctata, 0. F. Mull. X Zeiss oc. 2, obj. F. 



2 a. Ventral bristle of the foregoing. X Zeiss oc. 2, obj. F. 



2 b. Bristle with shorter terminal region from the same. X 700. 



3. Ventral bristle of Gastalia arctica, Mgrn., from south-west Ireland. X Zeiss oc. 2, 



obj. D. 



3 a. Tip of bristle, more highly magnified. 



4. Tip of shaft and terminal piece of the bristle of Gastalia fusca, Johnst. X 700. 



5. Bristle of Leocrates atlantica, Roule, with short tip. X about 100. 

 5 a. Tip of a bristle (terminal piece). X about 400. 



6. Tip of terminal piece of similar bristle in Leocrates Glaparedii, for comparison. X 



about 400. 



7. Tip of bristle of Dalhousiella Garpenteri, Mel. X about 400. 



8. Bristle of Mag alia per armata, De St. Jos. X Zeiss oc. 2, obj. D. 



8 a. Another of the same with longer tip. X Zeiss oc. 2, obj. D. 



9. Bristle of Pionosyllis (Syllis) hyalina, Grube. X Zeiss oc. 4, obj. F. 



9 a. Simple bristle in the posterior segments of the same. X Zeiss oc. 4, obj. C. 

 10. Bristle of Xenosyllis Kinbergi, Mel. X Zeiss oc. 2, obj. D., with draw-tube. 



11 a and b. Compound bristles of Sphserosyllis hystrix, Clap. X Zeiss oc. 4, obj. F. 



12. Simple bristle of the foregoing. X Zeiss oc. 2, obj. D, and draw-tube. 



13. Long swimming bristles of the same. X Zeiss oc. 2, obj. F. 



14. Bristle of Pionosyllis prolifera, Krohn, from Scalloway, with long tip. X Zeiss oc. 2, 



obj. D. 

 14 a. Another example of the foregoing with slightly shorter tip. X Zeiss oc. 2, obj. D. 

 14 b. Bristle from a bud of the same species dredged at Scalloway. X Zeiss oc. 2, obj. D. 

 14 c and 14 c' . Bristles of Pionosyllis prolifera var. Malmgreni. X 700. 



15. Bristle of the same form with shorter (average) tip from Guernsey. X Zeiss oc. 4, 



obj. F. 



16. Bristle of the foregoing from Luccomb Chine, with less distinctly bifid tip. X Zeiss 



oc. 4, obj. F. 



17. 17 a and 17 b. Bristles of Pionosyllis divaricata, Keferst. X Zeiss oc. 4, obj. F. 



18. Bristle of Trypanosyllis zebra, Grube. X Zeiss oc. 2, obj. F, draw-tube, full. 



