DESCRIPTION OF PLATES. 



PLATE 1. 



FIG. 1. Callopora dumerilli var. lata, n. var. Portion of the incrusting zoarium, X 20. Most of 



the zooecia have a single avicularium in front of the opesium. Oligocene (Anguilla 



formation). Southwest side Crocus Bay Bluffs, Anguilla, Leeward Islands. 

 FIG. 2. Floridina pyripora, n. sp. Surface of the type, X 20, showing the large, poorly defined 



opesiules and the pyriform aspect of the opesium. Oligocene (Antigua formation), 



Rifle Butts, Antigua, Leeward jslands. 

 FIG. 3. Floridina fttsifera, n. sp. The type specimen, X 20, exhibiting large, rounded opesiules 



and prominent polypidian convexity in the few zocecia intact. Oligocene (Antigua 



formation), Rifle Butts, Antigua, Leeward Islands. 

 FIG. 4. Ogivalina mutabilis, n. sp. The type specimen, X 20, with large irregular opesia, small 



ovicell, small gymnocyst, and one zooecium with a fusiform avicularium. Oligocene 



(Anguilla formation), Crocus Bay Hill, Anguilla, Leeward Islands. 

 FIG 5-7. Cupularia umbellata Defrance, 1823. (See also plate 2, figs. 17-21.) (5) Two zoaria, 



natural size; (6) celluliferous convex surface, X 20; (7) concave surface, X 20. 



Lower Miocene (Gatun formation), Banana River, Costa Rica. 

 FIGS. 8-10. Cupuladria canariensis Busk, 1859. (8) Two zoaria, natural size; (9) celluliferous 



convex surface, X 20; (10) concave surface, X 20. Lower Miocene (Gatun forma- 

 tion), Banana River, Costa Rica. 

 FIG. 11. Calpensia impressa Moll, 1803. Surface of an incrusting zoarium, X 20. Oligocene 



(Antigua formation), Carlisle marl-pit, Antigua, Leeward Islands. 

 FIG. 12. Puellina radiata carolinensis Gabb and Horn, 1862. Gabb and Horn's illustration of 



this variety. Eocene (Jacksonian) of South Carolina. 

 FIG. 13. Stylopoma spongites Pallas, 1766. Several zooecia, much enlarged (Smitt's figures of 



Hippothoa spongites). Recent, Gulf of Mexico. 

 FIG. 14. Hippoporina lata Smitt, 1862. View of several zocecia much enlarged (after Smitt). 



Recent, Gulf of Mexico. 

 FIG. 15. Porella bella Busk, 1860. Smitt's illustration of Escharella landsborovi. Recent, Gulf 



of Mexico. 

 FIGS. 16, 17. Stephanosella biaperta Michelin, 1842. Two views of this species (after Smitt). 



Recent, Gulf of Mexico. 

 FIG. 18. Photograph, X 20, of a specimen from Anguilla. Oligocene (Anguilla formation), 



Crocus Bay Hill, Anguilla, Leeward Islands. 

 FIG. 19. Holoporella albirostris Smitt, 1873. (See also plate 7, figs. 9-14.) Several zocecia much 



enlarged (after Smitt). Recent, Gulf of Mexico. 

 FIGS. 20-23. Stichoporina tuberosa, n. sp. (See also plate 6, figs. 16-19, plate 7, figs. 1-8.) (20) 



Two zooecia natural size; (21, 22) two views, X 20, of the convex, celluliferous side; 



(23) photograph of the concave side, X 20. Lower Miocene (Gatun formation), 



Banana River, Costa Rica. 



PLATE 2. 



FIG. 1. Membranipora vaughani, n. sp. Portion of the incrusting zoarium, X 15, showing th 



large interopesial denticles. Lower Miocene (Bowden horizon), Cercado de Mao, 



Santo Domingo. 

 FIGS. 2, 3. Acanthodesia savarti forma monilifera, n. sp. The hollow cylindrical zoarium, natural 



size and X 20. The beaded structure of the mural rim is apparent. Lower Miocene 



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

 FIG. 4. Hemiseptella lata, n. sp. Part of the incrusting type specimen, X 15, with some zocecia 



showing the characteristic inferior denticle. Lower Miocene (Bowden horizon), 



Cercado de Mao, Santo Domingo. 

 FIGS. 5-7. Nellia oculata Busk, 1852. (5) Normal zooecia with tubercles complete, X 19; (6) 



fragment showing large zocecia, X 19, the tubercles are replaced by pores; (7) view 



of fragment, X 19, showing two sides of the zoarium. Lower Miocene (Bowden 



horizon), Cercado de Mao, Santo Domingo. 

 FIGS. 8-10. Corynostylus ellipticus, n. sp. (8) Several fragments of the articulated zoarium, 



natural size; (9) anterior face of zoarium, X 19; (10) posterior face, X 19. Lower 



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

 FIGS. 11-13. Corynostylus labiatus, n. sp. (11) Complete segment of the articulated bilamellar 



zoarium, natural size; (12) photograph of the same, X 19, the salient opesial lip is 



shown; (13) section, X 15, exhibiting the interior of the zooecia in the middle row 



and a longitudinal section in the outer rows. Lower Miocene (Bowden horizon), 



Cercado de Mao, Santo Domingo. 

 FIG. 14. Thalamoporella granulala Levinsen, 1909. Small fragment, X 15, identified with this 



Recent species. Lower Miocene, Rio Cana, Santo Domingo. 



100 



