Plate 7. 



Figs. 1-8. Mamilloporn tuberosa Canu and Bassler, KtlO. i See also pi. U, figs. Ki-lO.) (p. ]92.) 



1. Group showdngthe upper, lower, and edge views of the zoarium, natural size. 



2. Zoarium with weathered surface, X 20, illustrating that the tulierosities are hollow. 



3. Zooecia, X 20, with one preserving the ovicell, which is hyperstomial and closed by the oper- 

 culum. 



4. Portion of a zoarium, X 20, with the tuberosities around the zooecial apertures well preserved 



5. Inner surface of zoarium, X 10. The tuberosities, a\-icularia, and hydrostatic i.?i cavities are 

 visible. 



6. Portion of figure 5, X 20. 



7. Edge view of fractured zoarium, X 20, illustrating zooecia open. 



8. Similar Aiew, X 20, but with the zooecia closed. 

 Lower Miocene (Bowden marl ): liowden, Jamaica. 



Figs. 9-14. Holoporclla alhiroslris Smitt, 1872. (See also pi. 32, tigs. 6-10.) (p. 174.) 



9. Fragment, X 20, showing zooecia without lieak with tlie typical form of aperture. 



10. Zooecia, X 20, showing interzooeeial avicularia. The oral beak is incomplete and in process 

 of formation. 



11. Interior of zooecia, X 20. 



12. General aspect of the zooecia with ovicell, X 20. 



13. Marginal zooecia, X 20. The deep zooecia have a beak bearing a small avicularium which 

 appears then as isolated. 



14. Zooecia, X 20, sho%ving the different aspects of the beak when broken. 

 Lower Miocene (Bowden mar! i: Bowden, Jamaica. 



251 



