Plaie II. 



Fig. 1. McUceritites sarissata Greg. Two Kenozooecia and a heterozooecium. X 34. 



— 2. The same species. Zooecia with opereula. > 34. 



— 3. Tlie saine species. A heterozooecium with mandible, surrounded by kenozooecia. X 34. 



— 4. MeUcerilites angnlosa d'Orb. An ooecium. Villedieu. X 20. 



— 5. The same species. Two heterozooecia of which the distal one has been 'regenerated by means 



of a new zooecium, and thereafter the remainder of the large aperture has been closed 

 (compare with figs. 7 and 9). Villedieu. x 20. 



— 6. The same species. Regeneration of a heterozooecium. The calcareous processes have not yet 



been formed distally to the new heterozooecium. Villedieu. X 34. 



— 7. A new zooecium has been formed within an old heterozooecium, and the rest of the aperture 



has been closed, but the processes corresponding to those seen in figs. 5 and 9 are here 

 very irregular. The zooecium is provided with a concave closure-plate which still has a 

 small opening. Villedieu. X 34. 



— 8. The same species. A heterozooecium. Villedieu. X 34. 



— 9. Regeneration of a heterozooecium. Villedieu. X 34. 



— 10. The same species. Fecamp. X 34. 



— 11. The same species. Couture. X 20. 



— 12. A zooecium in an old heterozooecium. Villedieu. X 34. 



— 13. The same species. Chatham. X 34. 



— 14. Two heterozooecia from the same colony. Couture. X 20. 



— 15. The same species. At the left side of the heterozooecium is seen a zooid intermediate between 



a zooecium and a heterozooecium. Fecamp. X 20. 



— It). A heterozooecium witli mandible. >, Villedieu. X 20. 



— 17. The same species. 



— 18. Another heterozooecium with a mandible the distal part of which has been broken off. 



— 19. The same species Villedieu. X 34. 



— 20. The same species. Regeneration of a heterozooecium. Bruillé-Poncé. X 34. 



— 21. The same species. Villedieu. X 20. 



— 22. Regeneration of a heterozooecium. Villedieu. X 34. 



— 23. MeUcerilites yotliica. var. acuminata. X 34. 



— 24. The same species. A heterozooecium. 



