EXPLANATION OF THE PLATES. 



Fig. 



1. Pe^matula naresi, KolL, from the ventral side. 



2. The same from the dorsal side. 



3. Pennatula sulcata, KoU., a, from the dorsal ; h, from the ventral side. 



4. A part of the dorsal side of Pennatula sulcata twice the natural size. 



5. Pennatula pearceyi, KolL, twice the natural size. 



6. Pennatula mim^ayi, Koll., from the dorsal side. 



7. The same from the ventral side. 



8. Pennatula moseleyi, KolL, from the dorsal side. 



9. A part of Pennatula moseleyi, from the ventral side. 



10. Virgularia hromleyi, KoU., fig. 1, natural size; fig. 2, from the A^entral aspect 



fig. 3, from the sides, — four times the natural size. 



1 1 . Virgularia gracillima, KolL 



12. Scytalium tentaculatum, KolL, d, dorsal ; v, ventral side. 



13. A young leaf of Scytalium tentaculatum magnified.; ('"') the tentacles at the end of 



the not yet developed polyp-cells. 



14. A smaller but developed leaf of Scytalium sarsi. 



15. Undeveloped leaf of Scytalium sarsi. 



16. Antlioptilum thomsoni, KolL, v, ventral side. 



17. A part of the same from the side, the polyps cut to show the lateral zooids. 



18. A tentacle of Antlioptilum thomsoni. 



19. Antlioptilum murrayi, KolL 



20. Part of the same from the ventral side, three times the natural size. 



21. The same from the dorsal side. 



22. Anthop>tilmn simplex, KoU., v, ventral ; d, dorsal side. 



23. Protocaulo7i molle, KolL, three times the natural size. 



24. Stachyptilum macleari, KolL, A, ventral ; B, dorsal aspect. 



25. A part of the dorsal side of the same, three times the natural size. 



26. Calcareous corpuscles of the tentacles of Stachyptilum. 



27. Microptilum willemdesi, KolL, A, natural size ; B, three times the natural size. 



28. Lept02Jtilu,m gracile, KolL, A, natural size ; B, three times the natural size. 



