hill: geology of JAMAICA. 255 



PLATE XXXII. 

 Old Elevated Reef Rock in Contact with Folded Eocene Strata near Barbican. 



PLATE XXXIII. 



Altered Structure of Old Elevated Reef Rock. 



PLATE XXXIV. 

 Upland Topography of Jamaica, Montpelier Valley. 



PLATE XXXV. 



Topograpliic Evolution of Jamaica. 



Fig. 1. Hypothetical Old Land, Pre-Tertiary. 



Fig. 2. Restricted Land during early Tertiary Subsidence. 



Fig. 3. Mid-Tertiary Expansion. 



Fig. 4. Axes of old Tertiary Uplift, Dotted Lines. Axes of Mid-Tertiary Uplift, 



Solid Lines. 



Fig. 5. Late Tertiary Degradation. 



Fig. 6. Drainage of Jamaica. 



PLATE XXXVI. 



Figs. 1-4. Trochosmilia hilli, sp. nov. Fig. 1, natural size; Fig. 2, calice from 

 above, about 1^ natural size ; Fig. 3, costae magnified ; Fig. 4, view 

 looking toward the septal margins, magnified, to show striae crossing 

 the septal margins and on the sides of the septa. 



Figs. 5-7. Cladocora jamaicaensis, sp. nov. Fig. 5, section across colony, | natu- 

 ral size ; Fig. 6, two branches, one showing lateral buds, natural size ; 

 Fig. 7, cross-section of corallite, to show septal arrangement, magni- 

 fied 2^ times. 



PLATE XXXVII. 



Figs. 1-4. Stylocoenia duerdeni, sp. nov. Figs. 1, 2, general views of specimen, 

 natural size ; Fig. 3, portions of calices magnified to sbow pillars at 

 their corners ; Fig. 4, sections of corallites, magnified about 6| times, 

 to sliow septal arrangement. 



Figs. 5-7. Multicolumnastraea cyathiformis (Duncan), gen. nov. Fig. 5, general 

 view of a specimen, natural size; Fig. 6, several calices, enlarged 4^ 

 times ; Fig. 7, a cahce more magnified, and made slightly diagram- 

 matic to show the relations of pali to septa, etc. 



PLATE XXXVIII. 



Fig. 1. Multicolumnastraea cyathiformis (Duncan), gen. nov. Cross-sections of 

 several corallites, magnified about 6f times. 



Figs. 2-4. Stiboriopsis jamaicaensis, gen. et sp. nov. Fig. 2, view of corallum 

 from above, natural size ; Fig. 3, a calice magnified 3 times, shows 

 the paliform teeth on the inner edges of the large septa; all the 

 septa are not distinct ; Fig. 4, cross-section of several corallites, 

 magnified about 4| times, shows the abundant dissepiments and 

 series joined by their costae. 



