EXPLANATION OF THE PLATES. 



Fig. 



1. Pennatula naresi, KolL, from the ventral side. 



2. The same from the dorsal side. 



3. Pennatula sulcata, Koll., 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 loearceyi, Koll., twice the natural size. 



6. Pennatula murrayi, 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, Koll., fig. 1, natural size; fig. 2, from the ventral aspect 



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



11. Virgularia gracillimct, 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. Antliojjtilum thomsoni, Koll., v, ventral side. 



17. A part of the same from the side, the poly[3s cut to show the lateral zooids. 



18. A tentacle of Anthoptilum thomsoni. 



19. Anthoptilum murrayi, Koll. 



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



21. The same from the dorsal side. 



22. Anthoptilum simp>lex, Koll., v, ventral ; d, dorsal side. 



23. Protocatdon molle, Koll., three times the natural size. 



24. Stachyptihmi 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 Stachyp>tilum. 



27. Microptilum ivillemcesi, Koll., A, natural size ; B, three times the natural size. 



28. LepAoptilum gracile, Koll., A, natural size ; B, three times the natural size. 



