PLATE XLI. 



Fig. 



2. 



3- 



5- 

 6. 



7- 

 8. 



lO. 



II. 



12. 



13- 

 14. 



15- 



16. 



17- 



18. 



19. 

 20. 

 21. 

 22. 



23- 



24. 



25- 



26. 



Spirorbh violaceiis Levinsen, p. 242. Collar seta from specimen from 

 the Grand Banks, Atlantic Ocean. 



Another collar seta. 



Sfirorbis verruca (Fahricius), p. 247. Collar seta showing slight pos- 

 terior notch in margin, from specimen on C/ilamys islandicus from 

 Greenland. 



Sfirorbis asferatus sp. nov., p. 245. Collar seta (serrations too dis- 

 tinctly marked). 



Abdominal seta, back view. 



Collar seta of another specimen (serrations invisible). 



Spirorbis eximius sp. nov., p. 239. Seta from second thoracic segment 

 of specimen from Pacific Grove, California. 



Spirorbis asperatus sp. nov., p. 245. Curved shaft associated with ab- 

 dominal seta. 



Spirorbis sulcatus (Adams), p. 249. 

 Haliotis from Guernsey, England. 



Spirorbis asperatus sp. nov., p. 245. 

 profile view. 



Apparent arrangement of teeth on uncini, greatly enlarged. 



Spirorbis verruca ( Fahricius ) , p. 247. Another collar seta showing but 

 very slight indication of posterior notch. 



Spirorbis semidentatus sp. nov., p. 237. Capillary seta from thorax. 



Spirorbis vitrcus (Fahricius), p. 247. Collar seta from specimen from 

 the Banks, Atlantic Ocean. 



Spirorbis niorchi Levinsen, p. 240. Caudal seta from Alaska speci- 

 men, back view. 



Another, in profile. 



Spirorbis semidentatus sp. nov., p. 237. Caudal seta. 



Spirorbis eximius sp. nov., p. 239. Collar seta. 



Spirorbis asperatus sp. nov., p. 245. Uncial plate from thorax, about 



Collar seta from specimen on 

 Abdominal seta (no serrations), 



\ view. 



Odd seta from third thoracic 

 Collar seta from specimen on 



Spirorbis eximius sp. nov., p. 239. 



fascicle. 

 Spirorbis morchi Levinsen, p. 240 



Chlajiiys islatidicus from Greenland. 

 Spirorbis formosus sp. nov., p. 251. Caudal seta from specimen from 



Bermuda. 

 Spirorbis semidentatus sp. nov., p. 237. Another caudal seta. 

 Spirorbis morchi Levinsen, p. 240. Seta from third thoracic fascicle 



of Alaska specimen. 

 Collar seta from same specimen. 

 Spirorbis semidentatus sp. nov., p. 



fascicle. 



237. Seta from second or third 



(340) 



