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TERTIARY FAUNA OF FLORIDA 



species is C. i^Cuneocorbnld) suhcovipressa Gabb (i860) from the Midway of 

 Tennessee, Alabama, and Arkansas. 



From the Chickasawan (or Lignitic) we have the following : 



1. Corbula concha Aldrich, Bull. Pal., ii., p. 7, pi. 5, fig. 6, 1895 ; Harris, Bull. 



Pal, ix., p. 66, pi. 13, fig. II, 1897. 



2. Corbula Aldrichi Meyer, Am. Journ. Sci., x.xx., 1885, p. 67; Bull. Ala. 



Geol. Surv., i., p. 83, pi. i, fig. 21, 1886; Harris, Bull. Pal, ix., p. 67, 

 pi. 13, figs. 12, I3«, 1897. 



3. Corbiila subengonata Dall, Harris, Bull. Pal, ix., p. 68, pi. 13, fig. \\a, 1897 



(as alabamiensis Lea, var.) ; Aldrich., Bull. Ala. Geol. Surv., i., p. 58, 



1886 (as C. engonaia Conrad). 

 This form is smaller, less inflated, thinner, and with more nearly parallel 

 dorsal and ventral borders than C. alabamiensis. The sculpture is finer than 

 in C. cngoiiata, which is a more elongated species. 



4. Corbula Grcgorioi Cossmann, Ann. Geol. et Pal, No. 12, p. 6, pi. i, figs. 



4, 5, 1894. 

 The first is a typical Corbula with nearly smooth surface; the others 

 belong to Cuneocorbiila. The last is abundant in the Claibornian, where it 

 has generally been mistaken for the young of C. nasuta Conrad. The Clai- 

 bornian contains a number of species some of which are restricted to this 

 horizon, but others are found in the beds below or continue into the Jack- 

 sonian. 



Corbula (Cuneocorbula) alabamiensis Lea. 

 Corbula aiabamu'iisis 'Lea., Contr. Geol, p. 45, pi i, fig. 12, Dec, 1833. 

 Corbula nasuta Conrad, Fos. Tert. Form., p. 38, Sept., 1833 ; Am. Journ. Scl, N. S.,i., p. 



398, pi 4, fig. 4, May, 1846; Harris, Reprint Fos. Tert. Form., pi. 19, fig. 4; not 



of Sby., P. Z. S., 1833, p. 35. 

 Corbula {Neara) nasuta de Gregorio, Mon. Claib., p. 231, pi. 36, figs. 36-50, 1890. 

 Corbiila subnasiita Orh\^\iy , Prodr. Pal, p. 382, 1850. 

 f Corbula nasuta -vzr. ima de Greg., op. cit., p. 231, pi. 37, figs. 5-8, i8go. 



Claibornian Eocene of Orangeburg, South Carolina; Clarksville and Clai- 

 borne, Alabama; White Bluff, Arkansas, and the Gatun beds of the Isthmus 

 of Panama. Also, according to Clark, in the Eocene of Virginia and Mary- 

 land. 



The C. nasuta of Sowerby is a recent species from the west coast of 

 Central America, described in March, 1833. It is somewhat difficult to dis- 



