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. 



Figure 



PL X. 



Gcindul mirabilis, on a fragment of Lophelia prolifera, natural size: a'> attaching disk. 



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. 



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



Gondul mirabilis, dorsal aspect, magnified: a) attaching disk; bi medial line; c) the uppermost pinnules, united; 



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



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



retracted. 



A cell, showing the spicular arrangement, magnified. 



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



A long spicule from the cell, magnified. 



A short do. do. do. do. do. 



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



Rachis, opened longitudinally on the ventral surface, magnified: a) dorso-lateral valves; bj 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. 



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



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



Calcareous corpuscles in the valves, magnified. 



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 fibriUous 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: ai connective tissue; h) longitudinal muscles on septum; c) transverse 



muscles on do.; 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. 



I. 

 2. 



3- 

 4- 



— 5- 



— 6. 



— 7- 



— 8. 



— 9- 



— 10. 



— II. 



— 12. 



— 13- 



— 14 



PI. XL 



Figure l. Cladiscus Lovéni. dorsal aspect, magnified. 



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



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



— 4. A polyp, magnified. 



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



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



— 7- A polyp, magnified. 



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



— 9. A zooid of usv..-il structure, magnified. 



— 10. Spicules from the skin. 



Figure 



PI. 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. 



