Johnson. — Polychaeta. 
PLATE 19. 
Figs. 193-198. Myxicola pacifica. 
Fig. 193. Tip of branchia. The web connecting the branchiae is shown as a 
border on the right side, and as ruptured tips at w. w. X 12.5. 
Fig. 194. Double-bordered, thoracic seta. X 450. 
Fig. 195. Stout, straight seta from thorax. X 450. 
Fig. 196. Abdominal seta., x 450. 
Fig. 197. Thoracic uncinus. X 321. 
Fig. 198. Abdominal uncinus. X 321. 
Figs. 199-203. Serpula Columbiana. 
Fig. 199. Profile view of operculum, x 6. 
Fig. 200. “Bayonet ” seta from first fascicle. X 187. 
Fig. 201. Thoracic seta with striated border. X 187. 
Fig. 202. Thoracic uncinus (many are 6- or 7-tootlied). X 275. 
Fig. 203. Abdominal uncinus. X 275. 
Figs. 204-208. Serpula zygophora. 
Fig. 204. Chisel-shaped, abdominal seta. X 321. 
Fig. 205. Profile view of operculum, x 9. 
Fig. 206. “Bayonet” seta from first fascicle. X 187. 
Fig. 207. Thoracic uncinus (6-toothed). X 321. 
Fig. 208. Abdominal uncinus (usually 6-toothed). X 321. 
