GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 517 



Plate 116. 

 Siderastrea silecensis, new species. Page. 



Figs. 1, la. Two views of the type. 



1. Corallum, one-half natural size 447 



la. Calices, X 6 447 



2. Photograph of thin section of corallites of specimen from the same 



locality as the type, X 6 447 



3. Calices, X 6, of a specimen supposed to come from the "silex" bed at 



Tampa, Florida 448 



Plate 117. 

 Figs. 1, la, 16. Siderastrea silecensis, new species. Three views of a specimen 

 from Coronet Phosphate Mine, Florida. 



1. Weathered cross section of corallites, X 6 449 



la. Longitudinal section of a corallite, X 6 449 



16. Thin section of corallites, X 6 449 



2. Siderastrea hillsboroensis, new species. Weathered cross section of 



corallites of holotype, X 6 442 



3. Siderastrea conferta (Duncan). Calices, X 6, of a specimen from sta- 



tion 6893, the middle or the upper horizon at Crocus Bay, Anguilla. . 453 



Plate 118. 

 Figs. 1, la. Siderastrea silecensis, new species. Two views, each X 6, of the 



calices of a specimen from near Bainbridge, Georgia 449 



2, 2a, 26, 3. Siderastrea pliocenica, new species. 



2. 2a, 26. Three views of the type. 2, corallum, natural size; 2a, cali- 



ces, X 4; 26, calices, X 6 441 



3. Worn calices of another specimen, X 6 441 



Plate 119. 

 Siderastrea dalli, new species. 



1, la. Two views of the type. 



1. Corallum, natural size 450 



la. A group of calices, X 4 450 



2. Calices of another specimen, X 6 450 



Plate 120. 

 Siderastrea conferta (Duncan). 

 Fig. 1. Cross section, X 3, of corallites of Duncan's type, Geological Society 



of London 451 



2, 2a. Two views of a specimen from the Pepino formation, 4 miles west 



of Lares, Porto Rico. 



2. Corallum, natural size 452 



2a. Calices, X 6 452 



3, 4. Specimens from Anguilla. 



3. Calices, X 6 453 



4 . Calices of another specimen, X 6 453 



Plate 121. 

 Siderastrea conferta (Duncan). 

 Figs. 1, la. Two views of a specimen from the Culebra formation, Canal Zone. 



1. Upper surface, natural size 453 



la. Calices, X 6 453 



2, 2a. Two views of a specimen from Anguilla. 



2. Upper surface, natural size 453 



2a. Calices, X 6 453 



