I'lnte VII. 



Fig. I. Meliceritites pulpebrosa iiov. nom. Two zooi-ciii with ;i convex closuiv-plntt- X 34. 



— U. Tlie same species. A zooecium with a flat closure-plate, x 34. 



— '^. The same species. Four zooecia with opercula. X 34. 



— 4. The same species. A zooecium with a beginniu;,' convex closure plate. X 34. 



— 5. The same species Five zooecia with a convex ciosure-plate. The proximal part of the closure 



lias in three of the zooecia been directed obliquely inwards. >; 34. 

 f). A zooecium with a distal convex and a proximal concave closure-plate. X; 34. 

 7. Three zooecia with a beginning distal and a well-developed proximal closure-plate. The proximal 



margin and a porliou of the lateral margins of the aperture are still seen. X 34. 



— 8. A zooecium with a convex closure-plate. X 34. 



— 9. Two zooecia in which both the distal and the proximal part of the closure are well-developed. 



X 34. 



— 10. Meliceritites durobrivensis Greg. A transverse section through a branch. Chatham. X 34. 



— 11. A portion of the atrial ring in the ooeciuni of Crista ebitrnea. Denmark. X 1"5 



— 12. The distal part of the ooeclum of Crista eburnea after the removal of the frontal wall. The 



atrial ring is seen. X 66. 



— 13. An opened, ooecium of Mel. magnifica after the adzooecial wall has been dissolved. The zooids 



covered by the ooecium are in this case completely developed. X -0. 



— 14. Au opened ooecium of Mel. magnifica after the adzooecial wall has been dissolved. The zooids 



covered by the ooecium have no calcified frontal wall. X 20. 



— 15. An opened ooecium of Met. magnifica X 20. 



— 16. A fragment of Mel. magnifica showing three different superficial laj'ers. X !• 



17. An opened ooecium of Mel. magnifica, which belongs to the growing end of a superficial layer 

 and the distal half of which covers an elder portion of the colony. The adzooecial wall 

 has been dissolved. X 20. 



— 18. An open ooecium of Mel. magnifica in the proximal part of which is seen a zooecium and 



three heterozooecia besides the aperture of the gonozooecium. It is likely to suppose that 

 the former have originally been cowered by a bulging part of the adzooecial wall, which 

 has later been destroyed. X 20. 



— 19. Mel. magnifica. A transverse section of a branch with an ooecium. X 14. 



— 20. An open ooecium of Mel. lamellosa dOib. The adzooecial wall together with a part of the 



underlying zooecial tubes have been dissolved. Xx 20. 



— 21. An opened ooecium of Mel. lamellosa. The proximal half of the atrial ring is seen. > 20. 



— 22. Mel. lamellosa. The distal end of an opened ooecium with the proximal half of the atrial ring. 



X 34. 



— 23. Mel. lamellosa. A transverse section of a colon}'. X 20. 



— 24. Sptropora micropora d'Orb. A transverse section. > 20. 



— 25. Entalophora Roemeri n. sp. A transverse section. >, 14. 



— 26. Zooecia of Ent. Roemeri. X 20. 



— 27. An opened ooecium of Mel. angulosa d'Orb. X 20. 



— 28. Mel. angulosa d'Orb. The distal end of an opened ooecium with the pioxinial half of the 



atrial ring. X l>(>. 



— 29. The distal part of an opened ooecium of Mel. angulosa d'Orb. seen from tlic proximal end. 



The whole atrial ring is seen. X 34. 



— 30. Mel. pijrenaica d'Orb. A transverse section. X !!• 



