66 Bulletin 9 358 



This, and many fragments of larger specimens were found at 

 Woods bluff. We await a more thorough investigation of the 

 Maryland and Virginia Eocene before identifying the form 

 specifically. 



Solen sp. ■ PI. 13^ fig. 9. 



This, and other fragments of this genus were found at Ozark, 

 Ala. , none of which however, were well enough preserved for 

 specific identification. 



Mactra praetenuis var. bistriata, PI. 13^ fig. 10. 



Syn. M. prcstenuis Con., Voss. Sh., Tert. P'orm, p. 42, 1833. Harris' 

 reprint, pi. 19, fig. 9. 

 M. prcstenuis Con., Amer. Jour. Sci., vol. i, p. 217, pi. 2, fig. 4. 

 M. prxtenuis Aid., Bull. i. Geol. Surv. Ala., p. 50. 1886. 



Conrad's descriptio7iof prcztenuis. — "Shell sub-triangular com- 

 pressed, equilateral, thin and fragile; umbonal slope sub-marginal, 

 nearly rectilinear, carinated ; beaks slightly prominent ; lunule 

 narrow elliptical ; two slightly prominent lines behind the um- 

 bonal slope." lyocality, Claiborne sand. 



There is some reason for supposing this to be a distincft species 

 from prrstenuis. It is smaller, and has both anterior and poster- 

 ior umbonal slopes well and deeply marked by concentric lines, 

 especially near the margins. This is especially true of the Sa- 

 binetown specimens. 



Localities. — Alabama: 4 miles above Hamilton Bluff, on the 

 Alabama ; Ozark. Texas: Sabinetown Bluff, Sa- 

 bine River. 



Type of prcstenuis. — Acad. Nat. Sci., Phila. 

 Specimen figured. — Ozark, Ala. Paleont. Museum, Cornell 

 University. 



Corbula concha, Pl. 13, fig. 11. 



Syn. C. concha Aid., Bull. Amer. Paleont. vol. i, p. 71, pl. 6, fig. 6, 1895. 



Aldricli' s original description. — "Shell oblong, ovate, inequi- 

 lateral ; surface striate ; posterior somewhat produced and round- 

 ed, and the larger ; anterior elliptically rounded ; tooth large 

 and oblong ; cicatrices very slightly impressed ; cavity of shell 

 rather deep. 



''Locality. — Bell's Landing, Ala. 



