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TERTIARY FAUNA OF FLORIDA 



Shell like Diplodonta, but with the concentric sculpture more or less broken 

 up into reticulations or pustules. 



This section includes several living and some fossil species of the Western 

 Hemisphere. The Cretaceous genus, Tenea Conrad, which has been referred 

 to this family, belongs to the Venerida, and Linearia Conrad, also included 

 by Zittel (Traite de Pal., p. 93) among the synonyms of Diplodonta, belongs 

 in the Tellinidce. 



Diplodonta hopkinsensis Clark. 



D. hopkinsensis Clark, Bull. U. S. Geol. Surv., No. 141, p. 79, pi. xxii., figs. I a-d, 1895. 

 Diplodonta sp. Harris, Bull. Pal., ii., p. 257, pi. 13, fig. 7, 1897. 



Hatchetigbee Bluff, Alabama, Harris ; Wood's Bluff, Alabama, L. C. 

 Johnson ; Thomasville, Alabama, Burns ; Evergreen, Virginia, Clark. 



This appears to be the common species of the Chickasawan (or Lignitic) 

 Eocene, which also contains the following species : 



Diplodonta ungnlina Conrad. 

 Astarte ungulina Conr., Am. Journ. Sci., xxiii., p. 342, 1833 ; Proc. Acad. Nat. Sci. Phila. 



for 1857, p. 166, 1858. 



Egeria rotunda Lea, Contr. Geol., p. 50, pi. i, fig. 17, 1833. 

 Mysia astartiformis Conr., Journ. Acad. Nat. Sci. Phila., 2d Ser., iv., p. 296, 1860; Am. 



Journ. Conch., i., p. 147, pi. II, fig. 15, 1865. 

 Mysia deltoidca Conr., Journ. Acad. Nat. Sci. Phila., 2d Ser., iv., p. 296, 1860 ; Am. Journ. 



Conch., i., p. 147, pi. ii, fig. 10, 1865. 

 Egeria nana Gregorio, Mon. Claib., p. 208, 1890; not of Lea. 



Chickasawan Eocene of Wood's Bluff, Alabama, L. C. Johnson ; Claiborne 

 sands at Claiborne, Alabama, Clarksville and localities in Clarke County, 

 Alabama ; and Glass Bayou, lower bed, near Vicksburg, Mississippi. 



This fine species is abundant at Claiborne and presents the appearance of 

 a precursor of the Miocene D. acclinis. The Egeria nana of Lea is often repre- 

 sented in collections by the young of this species, but is a small species of 

 Felaniella, not unlike one from the Oligocene of Bowden which will be de- 

 scribed later. It recalls Goodallia in form as suggested by Cossmann, but has 

 the dentition of Diplodonta. 



Diplodonta turgida Conrad. 

 Sphcerella turgida Conr., Journ. Acad. Nat. Sci. Phila., 2d Ser., i., p. 124, pi. xii., fig. 23, 



1848; Am. Journ. Conch., i., p. 9, 1865. 

 Sphcerella bulla Conr., Am. Journ. Conch., i., p. 138, pi. 10, fig. 9, 1865. 



