152 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



Plate 24. 



Figs. 1-7. Homoeosolen gamilei Gregory, 1909 page 62. 



1. Anterior face, X 12, showing a quite convex ovicell (broken) with its 



oeciostome, 



2. Anterior side of a branch, X 12, with the ovicell deeply embedded. 



3. Inferior or dorsal side of the branch, X 12. 



4. Branch with a broken ovicell showing the internal wall, X 12. 



5. A well-developed branch, X 25, with a median ovicell. 



6. Longitudinal thin section, X 12, showing the form of the tubes. 



7. A meridian section, X 10 (after Gregory 1909). 

 Cretaceous (Turonian) : Ste. Calais (Sarthe), France. 



FiQS. 8-14. Homoeosolen ramuJosus Lonsdale, 1850 page 61. 



8. 9. Two branches, X 12, showing the ovicell on the anterior face. 

 10. A longitudinal section, X 12, illustrating the expanded tubes. 



Cretaceous (Coniacian) : Chatham, England. 

 11, 12. Obverse and reverse sides of a young zoarium, X 10. 

 Cretaceous: Charing, Kent, England. 



13. Part of a branch with an entire pinnule and an ovicell developed, X 10. 



14. Longitudinal section through the end of a branch, X 9, showing the 



simple tubulate form of the zooecia (figs. 11-14, after Gregory, 1909). 

 Cretaceous (Coniacian) : Chatham. England. 



Plate 25. 



Figs. 1,2. Truncatula pinnata Iloemer, 1840 page 64. 



Two portions of the same zoarium, X 12, showing the ovicell which 

 here occupies abnormal places instead of its usual lateral position, 

 on account of the irregular character of the zoarium. 

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

 Figs. 3-5. Truncatula subpinnaia D'Orbigny, 1854 ____ page OG. 



3. Side view of branch, X 12, showing the lateral position of the ovicell. 



The broken ovicell above shows the structure of the internal wall. 



4. An ovicelled branch, X 12, in which the nematopores are closed by a 



calcareous epitheca. The apertures of the tubes are visible at the 

 extremities of the pinnules. 



5. Dorsal side of an ovicelled branch, X 12, showing the open nematopores. 

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



Figs. 6, 7. Truncatula filix Hagenow, 1851 page 64. 



Two views, X 10, exhibiting the lateral position of the ovicells (after 



Gregory, 1909). 

 Cretaceous (Maastrichtian) : Maastricht, Holland. 

 Fig. 8. Truncatula plebcia Novak, 1877. 

 Dorsal side, enlarged. 

 Cretaceous of Bohemia. 



Figs. 9-11. Truncatula discoidea, new species page 69. 



9. The discoid zoarium. X 6, viewed from below and showing the marginal 

 ovicell. 



10. Portion of the inferior face, X 12, showing the position of the ovicell^ 



between the pinnules. 



11. Superior face of the same zoarium, X 12. 



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



