Plate 6. 
Fig. 1. Labiopora miocenica Canu and Bassler, 1919. (p. 67.) 
Fragment of the unilamellar zoarium, X 20. The polypidiam tube and the small pores of the 
tremocyst are visible. 
Lower Miocene (Bowden horizon): Rio Gurabo, Santo Domingo. 
Fig. 2. Hippomenella infratelum Canu and Bassler, 1919. (p. 132.) 
Base of the bilamellar zoarium, X 20. One zooecium is regenerated, being replaced by an 
avicularium. 
Lower Miocene (Bowden horizon): Cercado de Mao, Santo Domingo. 
Figs. 3-5. Schizopodrella mutabilis Canu and Bassler, 1919. (p. 105.) 
3. The tubular zoarium, natural size. 
4. Surface, X 20, showing indistinct zooecia. 
5. Anotheqportion of the same zoarium, X 20, illustrating the shape of the zooecia. 
Lower Miocene (Bowden horizon): Cercado de Mao, Santo Domingo. 
Figs. 6-9. Steganoporella parvicella Canu and Bassler, 1919. (p. 62.) 
6. Fragments of the unilamellar zoarium, natural size. 
7. Zoarial fragment, X 20, illustrating the great irregularity in the zooecia. 
8. The usual zooecia, X 20, with regular arrangement. 
9. The most frequent aspect of the zooecia, X 20. The polypidian tube is very fragile and often 
broken or altered. 
Lower Miocene (Bowden horizon): Cercado de Mao, Santo Domingo. 
Figs. 10-15. Thalamoporella biperforata Canu and Bassler, 1919. (p. 62.) 
10. Fragments of the bilamellar zoarium, natural size. 
11. Specimen, X 20, exhibiting a well-preserved reticulocellarium. 
12. An example, X 20, showing the hollow tubercles worn and replaced by pores. A reticulocel¬ 
larium is here present. 
13. Drawing showing the real form of the aperture, X 77. 
14. A specimen, X 20, with a deformed membraniporoid zooecium near the upper corner. 
15. Another similar example, X 20, with a primoserial membraniporoid zooecium along the lower 
edge. 
Lower Miocene (Bowden horizon): Cercado de Mao and Rio Cana, Santo Domingo. 
Figs. 16-19. Mamillopora tuberosa Canu and Bassler, 1919. (See also pi. 7, figs. 1-8.) (p. 192.) 
16. Small fragments of the small, free, conical zoarium, natural size. 
17. Zoarial fragment, X 20, with large zooecia. 
18. Fragment, X 20, with small zooecia. The tubercles are well developed. 
19. Inner side of zoarium, X 20. 
Lower Miocene (Bowden horizon): Rio Cana, Santo Domingo. 
Figs. 20, 21. Diaperoecia milneana D’Orbigny, 1839. (p. 202.) 
Views of a fragment, natural size and X 12, referred to this species. 
Lower Miocene (Bowden horizon): Cercado de Mao, Santo Domingo. 
Figs. 22, 23. Adeona porosa Canu and Bassler, 1919. (p. 158.) 
Fragment of the free bilamellar zoarium, natural size and X 20. 
In figure 23, three gonoecia with their oral gibbosities are shown in the upper right-hand corner, 
an avicularian zooecium in the upper left-hand corner, and ordinary zooecia with their ascopores, 
and small areolae in the rest of the photograph. 
Lower Miocene (Bowden horizon): Cercado de Mao, Santo Domingo. 
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