PLATE XVIII. 
Fig. 1. Posterior margin of the first scale of Lagisca antarctica, . . x 90. 
Fig. 2. Outer edge of the second scale of Lagisca magellanica, var. 
grubei, ....... x 350. 
Fig. 3. Margin of the first scale of Lagisca magellanica, . . . x 350. 
Fig. 4. Portion of a scale of the same, . . . . . x 210. 
Fig. 5. Entire scale from the anterior third of Polynoe magni'pal'pa, . x 20. 
Fig. 6. Portion of a scale of Polynoella levisetosa, showing remarkable 
reticulations, . . . . . . x 350. 
Fig. 7. Anterior scale of Lagisca crosetensis, . . . . x 20. 
Fig. 8. Scale of Lepidonotus wahlbergi. Viewed as a transparent object, x 15. 
Fig. 9. Edge of a scale of Lagisca tenuisetis, . . . . x 350. 
Fig. 10. Portion of the edge of a scale of Euphione elisabethce, . . x 350. 
