80 Binney on Terrestrial Mollusks. 



H. Tcxasiana is also found in the neighboring Mexican 

 State of Tamaulipas. Reeve gives Alabama as the hab- 

 itat. 



HELIX MOORE AN A. 



Plate LXXVIII. Figuke 24. 



Testa orbiculato-depressa, carinata, umbilicata, albida ; spira obtusa, 

 plus niinusve elevata ; anfr. 6, vix convexlusculi, striati, ultimus infra 

 carinam non rotundatus ; sutura impressa; subtus stria; minus distinctie ; 

 anfr. 1:1, ultimus carina valde producta anfr. altcrum ct umbilicum pro- 

 fundum pene tegons ; apertura orbicularis, contracta, tridentata ; perist. 

 album, incrassatum, vix reflexiusculum, margine basali dentibus duobus 

 curvatis marginalibus sinu parvulo orbiculari scparatis, armato ; plica alba 

 rectangularis, dentilormis, excavata, in medio apertura; projecta ad colu- 

 mellam adnata et perist. margines connectans. 



SYNONYMS AND REFEKENCES. 



Eelix Mom-tana W. G. Binney, Proc. A. N. S. Phila. 1857, p. 184; Notes p. 4. 



DESCRIPTION. 



Animal not observed. 



Shell orbicular, depressed, white, carinated, umbilicated ; 

 spire more or less depressed, obtusely rounded ; whorls 6, 

 distinctly striated, hardly convex ; suture impressed ; be- 

 low the carina the body whorl is not rounded, but slants 

 down to the base which is parallel with the suture ; below, 

 the striee are less distinct ; at the umbilical region only 1\ 

 whorl is visible, the outer one strongly carinated so as to 

 conceal a portion of the umbilicus and a great part of the 

 remaining whorl; the umbilicus is very small, but perfo- 

 rates the shell to the apex, showing all the volutions with 

 the aid of a lens ; aperture rounded, contracted by three 

 teeth ; lip heavy, broad, white, hardly reflected, near the 

 basal extremity, quite on the edge, armed with two short, 

 incurving teeth, separated by a small, rounded sinus; on 

 the columella there is a tooth-like fold, square, projecting 

 across the aperture, its extremities joining those of the 

 peristome. 



