TRANSACTIONS OF WAGNER 

 I I 86 



TERTIARY FAUNA OF FLORIDA 



lines, slightly varying in strength ; beaks low, inconspicuous ; ligament short, 

 teeth short and small, hinge-line narrow, briefly excavated in front ; muscular 

 and pallial impressions normal. Alt. 8, lat. 10.5, cliam. 5 mm. 



This species differs from the preceding by its very thin shell, less turgid 

 and globose; the shorter and most rounded specimens are considerably less 

 inflated than in the nucleiformis, which does not seem to attain so large a size. 



Diplodonta acclinis Conrad. 



PLATE 28, FIGURES 2, 13. 

 Lucina acclinis Conrad, Fos. Tert. Form., p. 21, pi. 6, fig. 2, 1832; Whitfield, Mio. Moll. 



N. J., p. 62, pi. x., figs. 5, 6, 1895. 



Mysia americana Conrad, Fos. Medial Tert., p. 30, pi. 16, f. 2, 1838 (not Lucina amcri- 

 cana Defrance, 1823) ; Proc. Nat. Inst., ii., p. 185, 1842; Meek, Mioc. Checkl., p. 8, 

 1864. 



Diplodonta acclinis Conrad, Proc. Acad. Nat. Sci. Phila., ix., p. 166, 1858; Dall, Trans. 

 Wagner Inst., iii., p. 923, 1898. 



Basal Miocene of Shiloh, Cumberland County, New Jersey ; Miocene of 

 Jones Wharf, Maryland, Greensboro', Maryland, York River, Virginia, Wil- 

 mington and various localities in Duplin County, North Ca.rolina ; Pliocene of 

 Tilly's Lake, Waccamaw River, South Carolina, of Walton County, Florida, 

 and of the Caloosahatchie River; Burns, Harris, Stanton, and Dall. 



This is the finest and most conspicuous species of the Miocene ; if it 

 possessed, when living, a strong, polished epidermis it would probably have 

 found a place in the section Felaniella, to which its form and minor characters 

 show some resemblance. 



Diplodonta (Sphserella) subvexa (Conrad). 

 Spharella subvexa Conrad, Fos. Medial Tert., p. 18, pi. 10, fig. 2, 1838; Proc. Acad. Nat. 



Sci. Phila. for 1863, p. 577. 

 Erycina subconvcxa Orbigny, Prodr., iii., p. 115, 1852. 



Miocene of the James River near Smithfield, Virginia, Conrad ; and of the 

 Nansemond River near Suffolk, Virginia, Burns. 



This fine species has been discussed in connection with the section Sphcc- 

 rclla. It appears to be rare. Our largest specimen measures, alt. 36, lat. 40, 

 diam. 30 mm. 



The Sphcerella oregona Conr., of the " Smithsonian Checklist of Eocene 

 Fossils of North America" (p. 6, 1866) appears to be a nude name, at least 

 I have not been able to find any diagnosis of it in the literature, and it has not 

 been figured. 



