80 IIELICEA. 



H. Texasiana is also found in the neighboring Mexican 

 State of Tamaulipas. Reeve gives Alabama as the hab- 

 itat. 



HELIX MOOREANA. 



PLATE LXXVIII. FIGURE 24. 



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

 plus minusve elevata ; anfr. 6, vix convexiusculi, striati, ultimus infra 

 carinam non rotundatus ; sutura impressa ; subtus striae minus distinctae ; 

 anfr. 1^, ultimus carina valde producta anfr. alterum et umbilicum pro- 

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

 album, incrassatum, vix reflexiusculum, margine basali dentibus duobus 

 curvatis niarginalibus sinu parvulo orbiculari separatis, armato ; plica alba 

 rectangularis, dentiformis, excavata, in medio apertura3 projecta adcolu- 

 mellam adnata et perist. margines connectans. 







SYNONYMS AND REFERENCES. 



Helix Mooreana 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 striae 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. 



