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TERTIARY FAUNA OF FLORIDA 



cene of the West Indies and Curagao ; recent from Cedar Keys, Florida, south 

 to the north coast of South America, including Cuba, St. Domingo, Guade- 

 loupe, St. Thomas, etc., and also at Bermuda. 



This species is easily recognized by its radial sculpture. It is found in 

 borings in coral and limestone rock, which appear in many cases to have been 

 originally made by Lithophaga or other borers. In such cases the Corallio- 

 phaga is apt to take the elongated subcylindric form of the precursor. In 

 other cases it may be that the occupant is wholly the artificer of the cavity. 



Coralliophaga elegantula Ball. 



PLATE 25, FIGURES 2, 2a. 



Coralliophaga elegans Dall, Trans. Wagner Inst., iii., p. 920, pi. xxv., figs. 2, 2a, 1898; 

 not of Deshayes, Coq. Fos. bass. Paris, 1824. 



Upper Oligocene of the Chipola marl, Chipola River, Florida, and of the 

 silex beds of Ballast Point, Tampa Bay ; Burns and Crosby. 



Shell ovate, as figured ; thin, sculptured only by faint incremental lines ; 

 interior filled with a hard matrix by which it is obscured. Alt. 11.5, lat. 19.5, 

 diam. 7.0 mm. 



This species somewhat recalls the C. lithophagella Lamarck, of the Medi- 

 terranean, but is of more elegant shape. From any other American species it 

 can be distinguished by its smooth surface. The specific name first chosen 

 cannot be retained, as it has already been used for different fossil species by 

 Defrance, Deshayes, and others. 



Genus ORYCTOMYA Dall. 

 Oryctomya Dall, Nautilus, xi., p. 135, April, 1898; Trans. Wagner Inst., iii., p. 929, pi. 



xxxiv., fig. 1 6, 1898. 

 Coralliophaga Clark, Bull. U. S. Geol. Survey No. 141, P- 73, 1896; Harr., Bull. Pal., ii., 



p. 252, 1897. 



This group was originally proposed by me as a subgenus of Coralliophaga, 

 but further study of the latter group leads me to believe that the two forms are 

 generically distinct. The type is the following species : 



Oryctomya claibornensis Dall. 



PLATE 34, FIGURES 16, i6a. 



Oryctomya claibornensis Dall, Nautilus, xi., p. 135, April, 1898; Trans. Wagner Inst., 

 iii., p. 929, pi. xxxiv., figs. 16, i6a, 1898. 

 Claiborne sands at Claiborne, Alabama; Burns. 



