PLATE CXVI. 
Fig. 
1. Myvicola viridis, Milne Kdwards, from the neighbourhood of the Bell Rock, 
St. Andrews Bay. Hnlarged. 
la. Branchiv, showing spiral twist. Hnlarged. 
2. Lateral view of Protula tubulavia, Montagu, from Plymouth. Enlarged. 
3. Lateral view of Hydroides norvegica, Gunner, from St. Andrews. Hnlarged. 
4. Serpula vermicularis, l.; tube, with animal internally, attached to Pecten opercularis. 
Hnlarged. 
4a. Serpula vernucularis, L. Group attached to Nassa. Enlarged. 
5. Anterior end of Filograna implexa, Berkeley, Plymouth, projecting from its tube. 
Maenified. 
5a. The same with bud almost detached posteriorly. Magnified. 
5b. The same with an operculum and groups of reddish ova. Magnified. 
6. Portion of tube of Anphictene auricoma, O. F. Miller. Enlarged. Drawn by Rev. 
J. M. Anderson, M.A., B.Sc., under a lens. 
7. Anterior edge of pelagic tube of young Layis koreni, Malmgren, 30th June, 1891. 
x 350 diam. 
7a. Posterior edge of the same. X 550 diam. 
8. Operculum of Milograna impleaa, Berkeley. Magnified. 
9. Head of Leptonereis glauca, after Claparede. 
