PLATE CXVI.
F ig . 1. Myxicola viridis, Milne Edwards, from the neighbourhood of the Bell Rock,
St. Andrews Bay. Enlarged.
1 a. Branchiæ, showing spiral twist. Enlarged.
2. Lateral view of Protula tubularia, Montagu, from Plymouth. Enlarged.
3. Lateral view of Hydroides nwvegica, Gunner, from St. Andrews. Enlarged.
4. Serpula vermicularis, L. ; tube, with animal internally, attached to Pecten opercularis.
Enlarged.
4 a. Serpula vermicularis, L. Group attached to Nassa. Enlarged.
5. Anterior end of Filograna implexa, Berkeley, Plymouth, projecting from its tube.
Magnified.
5 a. The same with bud almost detached posteriorly. Magnified.
5-6. The same with an operculum and groups of reddish ova. . Magnified.
6. Portion of tube of Amphictene auricoma, 0. F. Müller. Enlarged. Drawn by Rev.
J. M. Anderson, M.A., B.Sc., under a lens.
7. Anterior edge of pelagic tube of young Lagis horeni, Malmgren, 30th June, 1891.
X 350 diam.
7 a. Posterior edge of the same. X 350 diam.
8. Operculum of Filograna implexa., Berkeley. Magnified.
9. Head of Leptonereis glauca, after Claparède.