102 DESCRIPTION OF PLATES. 



PLATE 6. 



FIG. 1. Labiopora miocenica, n. sp. Fragment of the unilamellar zoarium, X 15. The polypidian 

 tube and the small pores of the tremocyst are visible. Lower Miocene (Bowden 

 horizon), Rio Cana, Santo Domingo. 



FIG. 2. Hippomenella infratelum, n. sp. Base of a bilamellar zoarium, X 15. The zooecium is 

 regenerated, being replaced by an avicularium. Lower Miocene (Bowden horizon), 

 Cercado de Mao, Santo Domingo. 



FIGS. 3-5. Schizopodrella mutabilis, n. sp. (3) The tubular zoarium, natural size; (4) zoarium, 

 X 15, with indistinct zocecia; (5) another portion of the same zoarium, X 15, show- 

 ing the shape of the zocecia. Lower Miocene (Bowden horizon) , Cercado de Mao, Santo 

 Domingo. 



FIGS. 6-9. Steganoporella paniicella, n. sp. (6) Fragments of the unilamellar zoarium, natural 

 size; (7) zoarial fragment, X 15, showing the great irregularity in the zocecia; (8) 

 the usual zocecia, X 15, with regular arrangement; (9) the most frequent aspect of 

 the zocecia, X 15; 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, n. sp. (10) Fragments of the bilamellar zoarium, 

 natural size; (11) specimen, X 15, exhibiting a well-preserved reticulocellarium ; 

 (12) an example, X 15, showing the hollow tubules worn and replaced by pores; a 

 reticulocellarium is here present; (13) drawing showing the real form of the aperture, 

 X 60; (14) a specimen, X 15, with a deformed membraniporoid zocecium near the 

 upper corner; (15) another similar example, X 15, with a primoserial membrani- 

 poroid zocecium along the lower edge. Lower Miocene (Bowden horizon), Cercado 

 de Mao and Rio Cana, Santo Domingo. 



FIGS. 16-19. Stichoporina tuberosa, n. sp. (See also plate 1, figs. 20-23; plate 7, figs. 1-8.) (16) 

 Small fragments of the small free conical zoarium, natural size; (17) zoarial fragment, 

 X 15, with large zocecia; (18) fragment, X 15, with small zocecia; the tubules are well 

 developed; (19) inner side of zoarium, X 15. Lower Miocene (Bowden horizon), 

 Rio Cana, Santo Domingo. 



PKIGS. 20, 21. Idmonea milneana d'Orbigny, 1839. Views of a fragment, natural size and X 9, 

 referred to this species. Lower Miocene (Bowden horizon), Cercado de Mao, Santo 

 Domingo. 



FIGS. 22, 23. Adeona porosa, n. sp. Fragment of the free bilamellar zoarium, natural size and 

 X 15. In figure 23 these goncecia with their oral gibbosities are shown in the upper 

 right-hand corner, an avicularian zocecium in the upper left-hand corner and ordinary 

 zocecia with their ascopores, and small areolae in the rest of the photograph. Lower 

 Miocene (Bowden horizon), Cercado de Mao, Santo Domingo. 



PLATE 7. 



FIGS. 1-8. Stichoporina tuberosa, n. sp. (See also plate 1, figs. 20-23; plate 7, figs. 16-19.) (1) 

 Group showing the upper, lower, and edge views of the zoarium, natural size; (2) 

 zoarium with weathered surface, X 15, illustrating that the tuberosities are hollow; 

 (3) zocecia, X 15, with one preserving the ovicell, which is hyperstomial ; (4) por- 

 tion of a zoarium, X 15, with the tuberosities around the zocecial apertures well pre- 

 served; (5) inner surface of zoarium, X 7.5; the tuberosities, avicularia, and hydro- 

 static (?) cavities are visible; (6) portion of figure 5, X 15; (7) edge view of fractured 

 zoarium, X 15, illustrating zocecia open ; (8) similar view, X 15, but with the zocecia 

 closed. Lower Miocene (Bowden marl), Bowden, Jamaica. 



FIGS. 9-14. Holoporella albirostris Smitt, 1873, (See also plate 1, fig. 19.) (9) Fragment, X 15, 

 showing zocecia without beak but with the typical form of aperture; (10) zocecia, 

 X 15, showing interzocecial avicularia; the oral beak is incomplete and in process of 

 formation; (11) interior of zocecia, X 15; (12) general aspect of the zocecia with 

 ovicell, X 15; (13) marginal zocecia, X 15; the deep zocecia have a beak bearing a 

 email avicularium which appears then as isolated; (14) zocecia, X 15, showing the 

 different aspects of the beak when broken. Lower Miocene (Bowden marl) , Bowden, 

 Jamaica. 



