DESCRIPTION OF PLATES. 101 



PLATE 2 continued. 



FIGS. 15, 16. Lunularia species. Outer and inner sides of a fragment, X 15. Lower Miocene 

 (Bowden horizon), Rio Cana, Santo Domingo. 



FIGS. 17-21. Cupularia umbellata Defrance, 1828. (See also plate 1, figs. 5-7.) (17) Zoaria, 

 natural size; (18) photographs of the inner tuberous side, X 25; (19) ancestrular 

 region, X 19, in which the ancestrula is covered over by a normal zooscium; (20) 

 ancestrular region of another zoarium, X 19 ; the zooacia are arranged alternately and 

 in inverted order; (21) another view of the ancestrular region, X 19; here the ances- 

 trula is a membraniporoid zocecium. Lower Miocene (Bowden horizon), Cercado 

 de Mao, Santo Domingo. 



FIG. 22. Smittina ? brevis, n. sp. Surface of the bilamellar zoarium, X 15. Lower Miocene 

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



FIG. 23. Rhynchozoon vaughani, n. sp. (See also plate 4, figs. 1, 2.) A small fragment, X 15, 

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



PLATE 3. 



FIGS. 1-10. Metrarabdotos lacrymosum, n. sp. (1) A group of fragments, natural size; (2) frag- 

 ment, X 4.5, showing the little-expanded base; (3) another fragment, X 4.5; (4) a worn 

 branch, X 15; the avicularia are absent or little apparent; (5) surface, X 15, showing 

 salient peristomes and larger triangular avicularia; (6) worn zoarial fragment, X 20; 



(7) ordinary zocecia of a branch, X 15, with short, pointed, triangular avicularia; 



(8) ordinary zocecia, X 15, with long avicularia; (9) branch, X 15, with ovicelled 

 zooecia; the ovicell is slightly costulated and its frontal is granulose; (10) ovicelled 

 zooecia, X 15, with the ovicell not costulated. Lower Miocene (Bowden marl), 

 Bowden, Jamaica. 



FIGS. 11-16. Bracebridgia deformis, n. sp. (11) Fragments, natural size; (12) the usual aspect 

 of the zocecia, X 15; the large frontal pore does not perforate the wall; (13) zocecia 

 at the base of a zoarium, X 15; (14) zocecia, X 15, with the large frontal pore wanting; 

 (15) zocecia, X 15, with the peristomial avicularium slightly visible; (16) interior of 

 zocecia, X 15; the peristomial avicularium is visible, but the frontal pore does not 

 perforate the zocecial wall. Lower Miocene (Bowden marl), Bowden, Jamaica. 



PLATE 4. 



FIGS. 1, 2. Rhynchozoon vaughani, n. sp. (See also plate 2, fig. 23.) (1) The unilamellar zoarium, 

 X 15, showing young condition in which the zocecia are distinct; (2) old condition of 

 zoarium, X 15; the zocecia are indistinct and not oriented. Lower Miocene (Bowden 

 horizon), Cercado de Mao, Santo Domingo. 



FIGS. 3-12. Metrarabdotos colligatum, n. sp. (3-5) Different aspects of the base of the zoarium, 

 X 4.5; (6) three fragments, natural size, preserving base; (7) portion of zoarial sur- 

 face, X 15, with two ovicells preserved; (8) broad zocecia, X 15, characteristic of the 

 aged condition; (9) base of a zoarium, X 15, showing calcification and disappearance 

 of the apertures; (10) narrow zocecia, X 15, of youthful condition; (11) normal 

 zocecia, X 15; (12) longitudinal section, X 15, showing the interior of the zocecia. 

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



PLATE 5. 



FIGS. 1-5. Acanthodesia savarti forma texturata Reuss, 1846. (1) Fragments of the unilamellar, 

 hollow cylindrical zoarium, natural size; (2) zocecia, X 15, with traces of delicate 

 spines in the opesium; (3) inner side of zoarium, X 15, showing rectangular form of 

 zocecia; (4) zocecia, X 15, with a distinct rim around the opesium; (5) another surf ace, 

 X 15, showing the large size of the first zocecium of a new row. Lower Miocene 

 (Bowden marl), Bowden, Jamaica. 



FIG. 6. Conopeum ovale, n. sp. Ancestrular portion of the type specimen, X 15, incrusting a 

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



FIGS. 7-9. Gemelliporella punctata, n. sp. (7) Two fragments of the free cylindrical zoarium, 

 natural size; (8) an example, X 15, showing the development of the tremocyst; (9) 

 another fragment, X 15, showing the form of the aperture, ovicells (broken), and 

 arrangement of the areolse. Lower Miocene (Bowden marl), Bowden, Jamaica. 



FIG. 10. Callopora tenella Hincks, 1880. The incrusting zoarium, X 15, illustrating the thin 

 mural rim and the small tubercles on the gymnocyst. Lower Miocene (Bowden marl) , 

 Bowden, Jamaica. 



FIG. 11. Hemiseptella grandicella, n. sp. Surface of the incrusting zoarium, X 15. The largest 

 zocecia commence a new row. Lower Miocene (Bowden marl), Bowden, Jamaica. 



FIG. 12. Rhamphostomella laticella, n. sp. The incrusting zoarium, X 15. The areolar costules 

 are scarcely visible. Lower Miocene (Bowden marl), Bowden, Jamaica. 



