PLATE XXXIX — Continued. 



Fig 34. Spirorbis spirorbis (Linnd), p. 262. Collar seta from specimen from 

 Gloucester, Massachusetts, Atlantic coast. 



35. Spirorbis abnormis sp. nov., p. 245. Collar seta, short one. 



36. Spirorbis ca?tcellatus Fabricius, p. 248. Collar seta. 



37. Spirorbis quadrangularis Stimpson, p. 241. Back view of seta from 



second thoracic fascicle, from Greenland. 



38. Spirorbis stimpsoni Verrill, p. 250. Collar seta, about ^ view. 



39. Eupotnatus hmnilis sp. nov., p. 235. Operculum from specimen from 



Mexico. 



40. Collar seta, front view, showing arrangement of four basal spines. 

 All the figures by the author: i, 10, 17, 26, 27, 39, X 68; the others, 



except 33, X 425- 



(337) 



