HELIX. 



95 



Cat. No. 



No.ofSp. 



Locality. 



From whom received. 



Texas. 



W. G. Binney. 



Remarks. 



Fig. 170. 



Helix mooreana, W.* G. Binn. — Shell umbilicated, orbicular, 

 globose, white, subcarinated ; spire more or less depressed, obtusely 

 rounded ; whirls six, distinctly striated, hardly convex ; suture im- 

 pressed ; below the carina the body-whirl 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 one and a quarter whirl is visible, the outer one 

 strongly carinated so as to conceal a portion of the 

 umbilicus and a great part of the remaining whirl ; 

 the umbilicus is very small, but perforates the shell 

 to the apex, showing all the volutions with the aid 

 of a lens ; aperture rounded, contracted by three 

 teeth ; peristome heavy, broad, white, hardly reflected, 

 near the basal extremity, quite on the edge, armed with two short, incurv- 

 ing 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 ; an internal transverse tubercle on the 

 base of the shell; Greater diam. 8^, lesser 7 ; height 3 mill. 



Helix mooreana, W. G. Binney, Proc. Acad. Nat. Sci. Philad. 1857, 184; 

 Terr. Moll. IV, 80, pi. Ixxviii, f. 24.— Pfeiffek, Mon. Hel. Viv. IV, 52. 



Dcedalochila moof-eana, Teyon, Am. Journ. Conch. Ill, 64, pi. x, f. 8 (1867). 



Washington Co., Texas. Also in the neighboring Mexican 

 States. 



Helix mooreana, 

 enlaitred. 



Helix tliolus, W. G. Binney. — Shell broadly um- 

 bilicated, depressed-globose, rather solid, white, shining, 

 ribbed above, smoother below ; spire obtuse, little ele- 

 vated, rounded ; whirls seven, convex, the upper ones 

 more flattened, the last bluntly carinated ; carina not 

 reaching the peristome ; base parallel to the suture ; 

 umbilicus broad, half the larger diameter of the shell, 

 showing two and a half deeply grooved whirls plainly, 

 the others rapidly retreating towards the apex ; aperture 

 very oblique, semicircular, removed from the axis of the 

 shell, bordered with a scarcely reflected, white, heavy 

 peristome, grooved behind, and armed with two stout 

 teeth near the basal extremity, broadly reflected at the 



Fig. 171. 



