55 LiGXTTic Stagk 55 



thickened and constricled nt suture and suddenly rounded : 

 suture hidden in the groove thus formed ; surface finely marked 

 with lines of growth ; aperture oblong-ovate, terminating in a 

 rather broad canal, which turned to the left ; outer lip slightly 

 crenate within ; columella smooth, no perceptible callus on 

 posterior part. 



''Locality. — Bell's landing, Alabama. 



"Resembles somewhat the Jacksonian species of Clavclla, but 

 its whorls are few, spire low and canal recurved. The apex 

 is worn but appears to be blunt." 



When we consider the enormous amount of variation shown by 

 this shell in the Lower Claiborne, Claiborne, and especially 

 in the Jackson beds of Arkansas, we are obliged to regard this as 

 but a mild divergence from typical inanrafa. 



The type of this variety, herewith figured, is from Aldrich's 

 collecftion. 



Euthria dubia, I'l- 7, ^^- 6. 



Syn. Pisatiia? dubia Aid., Bull, i, Geol. Surv. Ala., icSS6, p. 25, pi. 3, 



fig- 13- 

 Pisania dubia Coss., Ann. Geol. et Pal., I2e liv., 1893, p. 34. 



Aldrich'' s original descripiioii. — "Shell fusiform ; whorls round- 

 ed, about eight in number ; spire acute ; surface covered with 

 equidistant revolving lines, which are broadly rounded, the 

 spaces between smooth. 



"Lines of growth ob.solete ; the embryonic whorls are smooth. 

 Aperture oblong-ovate ; canal moderate ; outer lip thickened and 

 striate within ; inner lip smooth, slightly excavated, thickened 

 and angular at jundlion with canal. 



Locality. — Lower bed, Wood's bluff. 



"The absence of a callosity at the po.sterior end of the aperture 

 makes the generic place doubtful." 



This species resembles several of the modern Luthria. There 

 .seems to be no trace of a po.sterior tooth on the columella, hence 

 it is not a Pisania. Its slightly irregular mode of growth 

 recalls .some .species of Neptunca. 



Locality. — Woods bluff. 



SpecijHcn figured. — Paleont. Museum, Cornell Unix-. 



