140 PROCEEDINGS OF THE NATIONAL MUSEUM. voi>. 61. 



Plate 2. 



Fig. 1. Meci/noecia micropora D'Orbigny, 1853 page 16. 



An ovicelled example, X 12. 



Cretaceous (Coniacian) : Tours (Indre-et-Loir), France. 

 Figs. 2-10. Mecynoecia annulosa Michelin, 1847 page 16. 



2. Several fragments, natural size. 



3. A bifurcated fragment. X 12, with an elongated sacciform ovicell 



showing a transverse oeciostome. 



4. Fragment, X 12, in which the ovicell is cordiforra. 



5. Another example, X 12, with a pyriform ovicell. 



6. A branch, X 12, with the ovicell placed among verticellate tubes. 



7. A branch, X 6, with the tubes arranged in quincunx at the base and 



in verticells at the top. 



8. A verticellate specimen, X 6, with small orifices. 



9. An example, X 6, with large orifices. 



Jurassic (Bathonian) : Occaignes (Orne), France. 

 10. An ovicelled specimen, X 12, in which the oeciostome is supported by 

 an ordinary peristome. 

 Jurassic (Bathonian) : Ranville (Calvados), France, 



Fig. 11. Microecia denisi, new species page 21. 



The ovicelled type specimen, X 12, exhibiting the minute oeciostome. 

 Cretaceous (Turonian) : Ruill6 Ponc6 (Loire-et-Cher), France. 

 Figs 12, 13. Trigonoecia michelini Blainville, 1830 page 18. 



12. A specimen, X 12, preserving two forms of ovicells. 



13. Another example with two triangular ovicells, X 12. 



Jurassic (Bathonian) : Ranville (Calvados), France. 



Fig. 14. Mecynoecia variaMlis Hagenow, 1851 page 16. 



An ovicelled specimen, X 12, with the upper end of the ovicell missing. 

 Cretaceous (Maastri .htian) : Maastricht, Holland. 



Plate 3. 



Figs. 1-5. Brachysoecia convexa, new species page 22. 



1. Cylindrical branching fragment, natural size. 



2. Portion of same, X 12, showing the ovicell and the zone of growth. 



3. View of the ovicell, X 25. The ovicell is short and the oeciostome is 



reflexetl and adjacent to the peristome. 



4. Ordinary zooecia, X 25, in which some of the apertures are closed by 



a diaphragm. 



5. A tangential thin section, X 25. 



Cretaceous (Cenomanian) : Le Mans (Sarthe) France. 

 Fig. 6. Bisidmonea tetragona Lamouroux 1821 page 24. 



6. A fragment, X 12, bearing the ovicell. 



Jurassic (Bathonian) : Ranville (Calvados), France. 

 Figs. 7-10. Bisidmonea? glohuloecia, new species page 25. 



7. 8. Fragment, natural size, and X 12, of this minute species. 

 9. The ovicelled side, X 12. 



10. Portion of branch, X 25. 



Cretaceous (Cenomanian) : Moutlouet (Maine-et-Loire), France. 



Fig. 11. Plagioecia clypeiformis D'Orbigny, 1853 page 28. 



11. Entire zoarium, X 12, bearing two ovicells. 

 Cretaceous (Turonian) : Fontaine d'Antoigne, near Chatellerault 

 (Vienne), France. 



