48 



In comparing the tertiary fauna of the West Indies and the living of the 

 same region, we find the list of genera common to both much smaller 

 than the preceding one, as the following table, compiled from Dr. Duncan's 

 papers, will show. A few additions have been made, based on the examina- 

 tion of fossils collected by Mr. Gabb in San Domingo : — 



Caryophyllia. Eusmilia. Lithophyllia. 



Paracyathus. Trochosmilia. Antillia. 



Trochocyathus. Parasmilia. Manicina. 



Flabellum. Dichoca^nia. Colpophyllia. 



Madracis. Euphyllia. Stephanocsenia. 



