EXPLANATION OF PLATES. 

 Platb 1. 



Fig. 1. Oncousoecia (FiUsparsu) l)if areata Ulrich and Bassler, 1907 page 6. 



Fragment of branch, X 12. preserving an ovicelL The oeciostonie is 

 transverse and wide. 



Cretaceous (Vincentovra marl) : Vincentown, New Jersey. 

 Figs. 2-5. Oncousoecia accumnlata, new species page 6. 



2. Three zoaria, natural size. 



3. A complete example, X 3, formed of discoid subcolonies piled upon each 



other. 



4. A portion of the same, X 12, illustrating the position of the ovicell on 



the margin of each subcolony. 



5. The extremity of a branch. X 12, illustrating the young portion of the 



subcolony. 



Jurassic rocks of Germany. 

 Figs. 6-8. Mecynoecia ohcsa, new species page 12. 



6. Two fragments, natural size. 



7. An ovicelled branch, X 12. 

 S. Another example, X 12. 



Recent: Philippine Islands, Sulade (Albatross Station D 5147). 



Figs. 9-11. Mecynoecia longipora, MacGillivray, 1895 page 13. 



9. Zoarial fragments, natural size. 



10. A branch, X 12, with the ovicell near the bifurcation and showing the 



prominent transverse oeciostome. 



11. Another ovicelled fragment, X 12, with the ovicell at the bifurcation of 



the branches and showing wrinkling of the tubes. 

 Recent: Philippine Islands. Anima Sola {Albatross Station D 5217). 

 Figs. 12, 13. Mecynoecia ramo-ussima D'Orbigny, 1850 page 14. 



12. A bifurcated branch, X 6, with nonverticellate tubes and two ovicells 



developed. 



13. A portion of an ovicelled branch, X 12, showing the transverse, elliptical 



oeciostome and the tubes arranged in verticells. 

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

 Figs. 14, 15. Mecynoecia stipata, new species page 15. 



14. A nonovicelled branch, X 6, illustrating the close arrangement of the 



tubes. 



15. A branch, X 12, showing a broken ovicell at the base and an abnormal 



one with a median furrow, higher up. 



Cretaceous (Turonian) : Ruill§ Ponce (Loir-et-Cher), France. 

 Figs. 16, 17. Mecynoecia (Spiropora) verticillata Goldfuss, 1827 page 13. 



16. An unovicelled branch, X 12. 



17. An ovicelled example, X 12, showing that the ovicell covers three verti- 



cells of tubes. 



Cretaceous (Maastrichtian) : Maastricht, Holland. 



Fio. 18. Notoplagioecia farringdonensis, new species page 30. 



Portion of a compressed branch, X 12, with a broken ovicell. 

 Lower Cretaceous (Aptian) : Farringdon, England. 



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