144 PROCEEDINGS OF THE NATIONAL MUSEUM, vol.61. 



5. Surface, X 25, exhibiting the prominent threads separating the zooecia. 

 Cretaceous (Danian), Herfolge (Seeland), Denmark. 



Figs. 6-10. Diaperoecia americana Gabb and Horn, 1862 page 46. 



6. Fragment of the solid ramose zoarium, natural size. 



7. End of a branch, X 12, with a thick zone of growth. 



8. A typical unovicelled branch, X 12. 



9. An ovicelled branch, X 12, bearing tubes wider apart than usual. 



10. An abnormal branch, X 12, in which the tubes of the lower portions 

 are growing in the opposite direction. 

 Cretaceous (Vincentown marl) : Vincentown, New Jersey. 

 Figs. 11-18. Stigmatoeclws punctatus, Marsson, 1887 page 48. 



11. 12. Celluliferous and dorsal sides of a branch, enlarged. 



1.S, 14. Longitudinal and cross sections, enlarged (figs. 11-14, after Marsson). 



15, 16. Lateral and celluliferous sides of an ovicelled example, X 12. 



17, Non celluliferous side of the same zoarium, X 12, showing the smooth 



dorsal, 

 IS. Celluliferous side, X 25. 



Cretaceous (Danian) : Faxe, Denmark. 



Fig. 19. Diaperoecia distans Hagenow 1851 page 45. 



An ovicelled example, X 12. 



Cretaceous (Danian) : Herfolge (Seeland), Denmark. 



Fig, 20. Diplosolen lineatuvi Gabb and Horn, 1862 page 47, 



The hollow ramose zoarium, X 12, with an ovicell. 

 Cretaceous (Vincentown marl) : Vincentown, New Jersey. 

 Figs. 21-22. Diplosolen entalophoroidcs new species page 47. 



21. The solid ramose zoarium, X 12, showing the ovicell wider than the 



branch. 



22. A portion of the same specimen, X 25, illustrating the occurrence of 



the small zooeciules and the separating threads between the aooecia. 

 Cretaceous (Danian) : Faxe, Denmark. 



Plate 10. 



Figs. 1-5. Plenronea fcnestrata Busk, 1859 page 50, 



1. Edge view of a branch, X 12 ; the ovicell is placed laterally and borders 



on the dorsal. 



2. Frontal, X 12, showing the lateral ovicell bordering on the median axis. 



3. A fragment, X 12, with a median subsymmetrical ovicell. 



4. Celluliferous side, X 25. 



5. Dorsal side, X 25 ; the tergopores open at the bases of deep sulci. 

 Eocene (Jacksonian) : Jackson, Mississippi, 



Fig. 6. Plagioecia divagaiis Canu and Bassler, 1920 page 27. 



An ovicelled zoarium, X 12. 



Eocene (Jacksonian) : Jackson, Mississippi. 

 Figs. 7-19. Terebellaria ramosissima Lamouroux, 1821 page 34. 



7. An unbranched specimen, natural size. 



8. Young example, natural size. 



9, 10. Very young zoarium, natural size and enlarged, 

 n. Portion of specimen (fig. 8) enlarged (figs. 7-11, after Haime, 1854), 



12. 13. Lateral and end views of a branch, enlarged. 



14. Surface enlarged, showing zones of apertures separated by zones of 



dactylethrae. 



15. Longitudinal section, enlarged (figs. 12-15, after D'Orbigny, 1853). 



16. Longitndiunl thin section, X 10, through end of brancli (after Gregory 



1896). 



