TRANSACTIONS OF WAGNER 

 I I 36 



TERTIARY FAUNA OF FLORIDA 



and therefore I have proposed for H. Jeffreysiana the generic name of Vasco- 

 niella. 



Hiiidsiella is represented in the American Tertiaries, so far as known, by 

 the following species : 



Hindsiella faba O. Meyer. 



Hindsiclla faba O. Meyer, Bull. Ala. Gaol. Surv., i., p. 82, pi. i, fig. 25, 1886. 

 Kellia faba De Gregorio, Mon. Claib., p. 211, pi, 30, fig. 16, 1890; Cossmann, Notes compl., 

 p. 12, 1894. 



Eocene of the Claiborne sands, Claiborne, Alabama. 



These small shells with their obscure cardinal characters are very puzzling 

 and difficult to diagnose clearly. M. Cossmann expresses the opinion that 

 thi's shell is a Kellia, but if Kellia is to be judged by its type, K. sub orbicularis, 

 the two hinges, though allied, cannot be regarded as identical. The hinge 

 of H. faba seems to me to agree in all essentials with Deshayes's figure (Bas. 

 Paris, pi. 43, fig. 33), though the posterior part of the hinge-plate in H. faba 

 is proportionately narrower and does not show the minute groove for the 

 external ligament clearly. The shades of obsolescence in the ligamentary char- 

 acters among these shells are so delicately graded that I cannot regard this as 

 a matter of importance. The dental characters of Kellia include one very 

 large and one small cardinal and three distinct laterals in the two valves, and 

 therefore it seems to me far more distinct from H. faba than it is from H. 

 arcuata. It is not at all impossible that, as is the case in Kellia, different indi- 

 viduals have the hinge somewhat differently developed. Where the teeth are so 

 unformed and amorphous as they are in many of the Leptonacea too much 

 stress cannot prudently be laid on minute differences. 



Hindsiella (faba var?) donacia Dall. 

 Plate 45, Figure 12. 



Eocene of Claiborne, in shell sand ; Burns. 



Shell small, donaciform, with variable outline, rather compressed, inequi- 

 lateral, the posterior side shorter, anterior dorsal margin sloping to the rounded 

 anterior end, base slightly insinuated; posterior dorsal margin with a shorter 

 and steeper slope, the posterior end of the shell subtruncate obliquely, the 

 basal angle rather marked; the whole shell slightly twisted; surface with 

 concentric somewhat irregular incremental lines and microscopic partly obso- 

 lete radial strije; interior polished, hinge like that of H. faba but with the 



