Plate VI. 



Kig. 1. Melicerilitcs Inbercnlala d'Oib. There are .seen eight kenozooecia, two zooecia with opercula 

 and two heterozooecia one of which has been regenerated. Basin de Paris. X 34. 



— 2. The same species. There is seen a heterozooecium with mandible. France. X 47. 



— 3. The same species. Five zooecia and a kenozooecium surround an ancestrula of whicli only the 



aperture is seen. Basin de Paris. > 47. 



— 4. Meliceritiles semiliina d'Orb. All the zooecia are provided with a flat closure-plate, whicli rises 



from the free edge of the oral ledge. X 34. 



— 5. The same species. Two zooecia with opercula. X 34. 



— 6. The same species. Two heterozooecia. X 34. 



— 7. Meliceritiles Filiozali \\. sp. There are seen the apertures of tliree ancestrulae, two kenozooecia 



and two heterozooecia. Fecamp. X 34. 



— 8. Four zooecia and a kenozooecium surround the ancestrula of a future colony. Fecamp. X 34. 



— 9. The same species. There are seen two heterozooecia and two kenozooecia. Fecamp. > 34. 

 10. The same species. One of the two zooecia is provided with a closure-plate which rises at a 



deeper level than the oral ledge. Fecamp. > 34 



— 11. Meliceritiles pijrenaica d'Orb. All the apertures which are of verj' different form and size seem 



to have been regenerated, perhaps several times. Tours. > 20. 



— 12. The same species. The suboral area is only represented by the pits. Villedieu. X 34- 



— 13. The same species Two zooecia with opercula The beak and the proximal tooth are distinct. 



Villedieu. X 34. 



— 14. The same species. The two strongly prominent zooecia seem to have been regenerated. Ville- 



dieu. X 20. 



— 15. The same species. Three zooecia with opercula. The strongly developed suboral areas are 



convex owing to a rich deposition of calcareous matter, and the pits have almost vanished. 

 Villedieu. X 34. 



— 16. The same species. All the zooecia liave no doubt been regenerated. Villedieu. X 20. 



— 17. The same species. Zooecia from the distal end of a colony. The oral ledge and the proximal 



tooth arc distinct, and only a single zooecium has been regenerated. Villedieu. X 20. 



— 18. The same species. There are seen a heterozooecium and an operculum. Most zooecia have been 



regenerated. Villedieu. X 20. 



— IS). The same species. The suboral area is short and broad and provided with two lateral pits. 



Villedieu. X 34. 



— 20. The same species. The zooecia which have no doubt all been regenerated are placed in all 



directions. Villedieu. X 20. 



— 21. The same species. Six zooecia surrounding a heterozooecium. They seem all to have been 



regenerated. Villedieu. > 20. 



