237 Midway Stage ' 113 



We have figured one type specimen which belongs to Dr. 

 Safford's collection. It is labelled as coming from 2 miles south 

 of Middleton, Tenn. Of the three type specimens all are young 

 or small and hence do not show well the characters of the species. 

 An older specimen is shown by fig. 18. This was found in with 

 T. pumila as labelled by Gabb or Safford. 



Localities of this variety. — Texas: Kemp, Kaufman Co. 



Arkansas: Johnson's well, Little Rock; Olsen's 



switch, a few miles S. W. of Little Rock. 

 Tennessee: Muddy creek, E. of Middleton. 

 Mississippi: 2 mi. E. of Ripley. 

 Georgia: Base of Midway, Chattahoochee river. 



Mesalia pumila var. alleiitonensis , PI. 11, figs. 20, 21. 



Syn. Turritella allentonensis Aid., Geol. Surv. Ala., 1894, p. 

 246, pi. 13, fig. 4a & 6. 



This form as shown by the figures seems to us to be simplj' one 

 of the pumilce. The gradations from one into all the other vari- 

 eties seem quite complete. 



Locality. — Alabama: On or near McConnico's plantion, i>^ 

 mi. S. W. of Palmer's mill. 



Aldrich's collection. 

 Mesalia alabamiensis , PI. 12, fig. i. 



Syn. Potamides alabamiensis Whitf. , Am. Jr. Conch., vol. i, 

 1865, p. 266, pi. 27, fig. 13. 



Whitfield' s original description. — "Shell turrited, consisting of 

 about eight short, strong, rounded volutions; columella short; 

 aperture obliquely ovate, lower basal portion auger-shaped; entire 

 surface marked by strong, sharply elevated, revolving lines, 

 strongest on the middle of the volution; eleven can be counted 

 on the body whorl; the revolving lines are crossed by faint lines 

 of growth, which have a slight sigmoidal curve. 



''Dimensions. — Length of shell 1.12 inches, transverse diame- 

 ter of body whorl .45 inch. 



''Locality. — Six miles below Prairie Bluff, Alabama."-' 



This is evidently the descendant of, or perhaps is identical with, 

 M. pumila Gabb. In the lower Lignitic of Alabama it shows a 

 vast amount of variation. The specimens herewith referred to 

 this species are of nearly typical form, but are small. 



Locality. — A1.ABAMA: >^ mi. W. of Graveyard hill. 



Type. — Hall collection. 



