154 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



Figs. 19-2o. Diplodesmopora opposita, new species page 60. 



10. Lateral view of an example with a broken ovicell X 12. The fascicles 

 are biserial and the nematopores are closed by an epitheca. 



20. A worn example, X 12, with the dorsal nematopores visible. 



21. Another example with a complete ovicell, X 12. The fascicles are uni- 



serial and the nematopores are closed. 



22. Transverse section, X 12, between the fascicles. 



23. An incomplete transverse section, X 12, showing the zone of nematopores. 



24. Transverse section, X 12, through the middle of the fascicles. The dorsal 



is very thick and is perforated by the nematopores. 



25. Longitudinal section, X 12. The tubes are long, expanded with dorsal 



gemmation. They branch into dorsal nematopores which are long, 

 rectilinear, with much thickened walls. 

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



Plate 28. 



Fifis. 1-7. Desmepora setnicylindrica Roemer, 1840 page 77. 



1. Lateral view of branch, X 12, showing the ovicell. 



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

 2, 8. Anterior view of a branch enlarged and cross section of the same 

 (after Marsson.) 

 Cretaceous : Island of Riigen. 

 4. Zoarium, natural size. 

 5,6. Posterior face enlarged. 



7. Anterior face enlarged (figs. 4-7, after Lonsdale). 

 Cretaceous of England. 



Fir..«!. 8, n. Desmepora reiissi Gregory, 1909 page 77. 



Fragment, natural size, and enlargevl. 

 Cretaceous (Cenomanian) : Plauen. Saxony. 



Figs. 10-15. Discorytis end csi MicheVm, 1844 page 71. 



10, 11. Zoarium natural size and enlarged. 



12. Section through the zoarium. enlarged. 



13. Anterior side of the zoarium enlarged (figs. 10-13, after D'Orbigny. 



1852). 



14. Posterior side of zoarium showing arrangement of numerous ovicells. 



15. Part of another ovicell bearing zoarium, X 12. 

 Cretaceous (Cenomanian) : LeMans (Sarthe), France. 



Fig. 10. Discocytis eccentrica Ulrich and Bassler, 1907 page 72. 



Portion of an ovicelled zoarium, X 12. The ovicell is a vesicle with 

 special walls, situated on the edge of the zoarium and branched be- 

 tween the fascicles. 

 Cretaceous (Vincentown marl) : Vincentown, New Jersey. 

 Figs. 17. Discocytis essenensis Simonowitsch, 1871. 



A median section through the zoarium enlarged (after Simonowitsch, 



1871). 

 Cretaceous (Cenomanian) : Essen, Germany. 



