TRANSACTIONS OF WAGNER 

 964 



TERTIARY FAUNA OF FLORIDA 



Genus EGERELLA Stoliczka. 



Egerella Stoliczka, Cret. Pel. India, p. 133, 1870. Type Egcria subtrigonia Lea. 

 Egeria (pars) Lea, Contr. Geol., p. 49, 1833 ; not of Roissy, 1806. 



Lea named no type, and his genus included species of Diplodonta, Angulus 

 or Mara, and Abra, as well as Donaces of the type of E. subtrigonia, for which 

 Stoliczka proposed the name Egerella. 



Egerella subtrigonia (Lea). 



Egeria subtrigonia Lea, Contr. Geol., p. 53, pi. i, fig. 22, 1833. 

 Egeria veneriformis Lea, of. cit., p. 53, pi. i, fig. 23, 1833. 

 Egeria donacea Conrad, Am. Journ. Conch., i., p. 146, pi. n, fig. 12, 1865. 



Eocene of the Claiborne sands, at Claiborne, Alabama. 



This is an extremely common fossil at Claiborne, of variable outline but 

 always tolerably plump. 



Egerella triangulata (Lea). 



Egeria triangulata Lea, Contr. Geol., p. 51, pi. i, fig. 20, 1833. 

 Egeria Bucklandii Lea, op. cit., p. 52, pi. i, fig. 21, 1833. 

 Donax limatula Conrad, Fos. Tert. Form., p. 42, 1833 ; fide Conrad in Morton, App., p. 7, 



1834- 



Eocene of the Claiborne sands, at Claiborne, Alabama. 



I have retained Lea's name for this species because Conrad's brief diag- 

 nosis without a figure does not contain data sufficient for discriminating the 

 species from any of the others, and we know that his subsequent identifications 

 in Morton's appendix are frequently only plausible guesses. On the other 

 hand, there can be no doubt as to the shell which Lea described and figured in 

 a perfectly satisfactory manner. 



This species is comparatively rare, but the young of the same size as E. 

 subtrigonia are much more compressed and triangular than the latter. E. 

 Bucklandii Lea is merely one of the individual mutations of a rather variable 

 species. E. fragilis Conrad (in Mort. App.) is a nude list-name and was per- 

 haps based on the young of this species. It has never been described. 



Genus DONAX (Linne"). 



< Donax Linne, Syst. Nat., ed. x., p. 686, 1758 ; Bruguiere, Enc. Meth., i., p. xiv., pi. 



260, 1797. 



< Cuneus Da Costa, Brit. Conch., p. 202, 1778. 



> Donax Scopoli, Intr. ad Hist. Nat, p. 398, 1777. 



