334 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Stylophora conferta Reuss. 

 tuberosa Reuss. 



affinis Duncan (described from Santo Domingo). 

 granulata Duncan (described from Bowden, Ja- 

 maica). 

 From Santo Domingo: 



Stylophora affinis Duncan. 



var. minor Duncan (a valid species). 

 raristella (Def ranee). 

 From Bowden, Jamaica: 



Stylophora granulata Duncan. 

 From St. Croix, Trinidad : 



Stylophora minuta Duncan. 



raristella (Def ranee). 



mirabilis Duncan (not Duchassaing and Michelotti). 



I described in 1900 * Stylophora ponderosa from the Oligocene of 



Salt Mountain, near Jackson, Alabama, and Stylophora minutissima 



from the Oligocene of Blue or Russell Spring, near Bainbridge, 



Georgia. 



I recognize as valid the six species described as new by Duncan and 

 the two later described by myself. Duncan's identifications of West 

 Indian specimens with European species are all discarded as they are 

 probably erroneous. 



In addition to the six species here described as new, I have de- 

 scribed six other species in manuscript not yet published, making a 

 total of at least 20 species of Stylophora known to me from the 

 American Tertiary formations. The stratigraphic range of the genus 

 in America is from the upper Eocene to Miocene. 



STYLOPHORA IMPERATORIS, new species. 



Plate 74, figs. 1, la, 2, 3, 4, 4a, 5. 



Corallum attaining a rather large size, the basal part of some 

 colonies as thick as a man's wrist. The cross-section of branches 

 ranges in form from subelliptical to curved lamellate. The following 

 are the diameters of the broken ends of the specimen, which is 62.5 

 mm. long, represented by plate 74, figure 1. 



Diameters in millimeter s of branches of Stylophora imperatoris. 





Lesser 

 diameter. 



Greater 



diameter. 



Basal end 



14.5 

 13.0 



9. 5 to 16 



27.0 



Smaller branch 



17.5 



Wider branch 



34 









1 U. S. Geol. Survey Mon. 39, p. 132, 1900. 







