XV 



Figs. 12. 13, 14, 15, 16. Spicules from body and tentacles of a polyp. 

 Figure 17. Spindles from oesophagus and gastral filaments, magnified. 



— 18. Cruciform spicules (Vierling) from same parts, magnified. 



pl x. 



Figure 1. Gondul mirabilis, on a fragment of Lophelia prolifera, natural size: a) attaching disk. 



— 2. Same animal, ventral aspect, magnified: a) attaching disk; b) a pinnule; c) the two uppermost pinnules, united; 



d) inner margin of pinnule, united with the rachis; e) outer margin of pinnule; f) an axial polyp. 

 — ■ 3. A piece of the ventral surface, covered by a thick layer of epithelium and mucus, magnified. 



— 4. Gondul mirabilis, dorsal aspect, magnified: a) attaching disk; b) medial line; c) the uppermost pinnules, united; 



d) outer (upper) margin of pinnule; e) zooids. 



— 5. Same animal, lateral aspect, magnified: a) attaching disk; b) inner margin of pinnule; c) cell in which the polyp is 



retracted. 



— 6. A cell, showing the spicular arrangement, magnified. 



— 7. A cell, with extended polyp, magnified: a) upper margin of cell; b) polyp-body with its tentacles. 



— 8. A long spicule from the cell, magnified. 



— 9. A short do. do. do. do. do. 



— 10. A tentacle, magnified: a) spicules; b) pinnules. 



— 11. Rachis, opened longitudinally on the ventral surface, magnified: a) dorso-lateral valves; b) ventro-lateral valves; 



c) rise and fall on the free undulating margin of a dorso-lateral valve; d) the dorso-lateral valves united in the 

 upper fourth of the rachis; e) the line indicating the suture; f) ventro-lateral valves. 



— 12. Transverse section of the rachis in its lowermost fourth but one, magnified: a) dorso-lateral valves; b) ventral 



canal; c) dorsal canal; d) ventro-lateral valves; e) lateral canals; f) nutritive canals in the coenenchym. 



— 13. Calcareous corpuscles in the valves, magnified. 



— 14. Entodermic cells on the valves, magnified. 



— 15. Ectodermic cells on the rachis, magnified. 



— 16. Brown-coloured cells underneath the ectodermic cells, magnified: a) oblong cells (mucous cells?); b) round do. 



— 17. Transverse section of the fibrillous connective tissue of the polypidom, magnified 600 times, drawn by Camera 



lucida: a) corpuscles of connective tissue, with offshoots; b) a nutritive canal with its epithel. 



— 18. Transverse section of a polyp, magnified: a) connective tissue; b) longitudinal muscles on septum; c) transverse 



muscles on cio.; d) pigmented epithel on outer wall of oesophagus. 



— 19. Entodermic cells, investing the chambers, magnified. 



— 20. Brown-coloured cells, covering the outer wall of the oesophagus, magnified. 



Figure 



1. 



2. 

 3- 

 4. 

 5- 

 6. 



•7- 

 8. 



9- 

 10. 



PL' XI. 



Cladiscus Lovéni, dorsal aspect, magnified. 



A fragment of the same animal, ventral aspect, magnified. 



A dorso-lateral region, with polyps and zooids, magnified. 



A polyp, magnified. 



Pennatula distorta, varietas aculeata, ventral aspect, natural size. 



A fragment of the same animal, dorsal aspect, natural size. 



A polyp, magnified. 



A spiniform zooid, surrounded by zooids of usual structure, magnified: a) long spicules. 



A zooid of usual structure, magnified. 



Spicules from the skin. 



Figure 1 



— 2 



3 



— 4 



— 5 



PL XII. 



Kophobelemnon Mobii, dorsal aspect, natural size. 



A fragment of the same animal, ventral aspect, natural size. 



Spicules in the skin, slightly magnified. 



The same kind of spicules, more highly magnified. 



A transverse section of the rachis, magnified: a) a zooid; b) spicules in the elongated (inner) connective tissue; 



c) generative products of a zooid. 



