142 PROCEEDINGS or THE NATIONAL MUSEUM. vol.61. 



Figs. 6-8. Cavaria pustulosa Hagenow, 1S51 page 32. 



6. Fragment, natural .9ize. 



7. An ovicelled example, X 12, showing also the thin slightly salient 



peristome. 



8. An ovieelled example, X 12, composed of several lamellae. 

 Cretaceous (Daniau), Herfolge, and Faxe, Denmark. 



Figs. 9-12. Plagioecia oMiqiia D'Orbigny, 1850 page 29, 



9. A fragment, X 12, with an oval ovicell which deforms the zoarial 



margin. 



10. An example, X 12, with a fusiform ovicell. 



11. A specimen, X 12, in which the ovicell is placed near the zoarial 



margin. 



12. A specimen, X 12, with a long fusiform ovicell. 

 Cretaceous (Coniacian), Tours (Indre-et-Loire), France. 



Plate 6. 



Figs. 1, 2. Cea rustica D'Orbigny, 1852 page 37. 



1. Zoarium enlarged, showing the funnel shape of the orifice. 



2. Transverse section, X 12, illustrating the thick zoarial walls. 

 Cretaceous (Santonian) : Vendome (Loir-et-Clier), France. 



Figs. 3-9. Cca compressa D'Orbigny, 1852 page 37. 



3. 4. Lateral and end views of extremity of zoarium, enlarged, showing the 



zone of growth on the basal lamella. 



5. Zooecial orifices exhibiting form when the oral tongue is completely 



developed and perforated (figs. 1, 3-5 after D'Orbigny, 1852). 



6. Aspect, X 43, when the oral tongue is incompletely developed. 



7. Zoarium, X 12, provided with an ovicell (figs. 6, 7. After Filliozat, 



1917). 



8. Longitudinal section showing the thickening of the walls at the extrem- 



ity of the tubes. 



9. Longitudinal section of a single wall, highly magnified (figs. 8, 9, after 



Pergens, 1883). 

 Cretaceous (Coniacian), Tours (Indre-et-Loire), France. 



Fig. 10. Cea lamellosa D'Orbigny, 1852 page 37. 



Zoarium with three ovicells, X 12. 



Cretaceous (Coniacian), Villedieu (Loir-et-Cher), France 



Fig. 11. Cea tubulosa D'Orbigny, 1852 page 37. 



An ovicelled example. X 235. (After Filiozat, 1907). 

 Cretaceous, Besse (Sarthe), France. 

 Figs. 12-14. Cea suhcoiniiressa D'Orbigny, 1852 page 37. 



12. Zoarial fragment, X 25, showing the orifice of the tubes. 



13. An example, X 12, with a convex ovicell. 



14. Another example, X 12, in which the ovicell is flat. 

 Cretaceous (Santonian) : Vendome (Loir-et-Cher), France. 



Plate 7. 



Figs. 1-3. Stathmepora johnstrupi Pergens, 1886 page 40. 



1. Zoarial fragments, natural size. 



2. An example, X 12, preserving a broken ovicell. 



8. A typical specimen, X 12, with well-developed complete ovicell. 

 Cretaceous (Danian), Faxe, Denmark. 



