Remarks on Certain Species of N. A. Helicidce. 117 



Seeing tliat Say pronomiced this species and IL Postelliana 

 to be avara, I can understand tlie remarks of Dr. Binney 

 quoted by me, Annals Yol. YIL p. 31, but still am under the 

 impression that he could not have seen the sliell descrihcct by 

 Say as //. avara. 



ISeBas Baitr©rcreifi§, laov. §t>. 



Plate IV. fig. 3-4. 



T. urabilicata, depresso-globosa, teiuiiuscula, costnlato-striata, corneo- 

 lutea; spira convexa; anfr. 6, convcxiusculis, ultimo antice vix deflexo, 

 ad aperturam valde constricto, bicrobiculato, ad pcriplieriara subangulato, 

 basi convexo, intra umbilicum excavate ; apertura obliqua, lunari, dente 

 linguiformi valido, flexuoso, in pariete apertnrali intrante coarctata ; perist. 

 albo, intus calloso, reflexo, margine dextro dente obtuso introrsura flexo, 

 basali dente lamelliformi submarginali, in medio transversim taberculato, 

 instructo; dente inferiori intra aperturam producto, tuberculum validum 

 form ante. 



Shell umbilicate, globose, depressed, thin, with riblike stripe, 

 yellowish horn colored ; spire convex, whorls six, moderately 

 convex, the last scarcely descending, much constricted at the 

 aperture, with two exterior pits, subangular at the periphery, 

 convex beneath, grooved within the umbilicus; aperture 

 oblique, lunate, with well developed arcuate parietal tooth ; 

 peristome white, thickened within, reflected; on the right mar- 

 gin an obtuse inflected tooth, at the base a submarginal lamelli- 

 form tooth, with transverse tubercle in the centre ; the basal 

 lamella continued within the aperture, where it forms a strong 

 white tubercle. 



Diam. maj. 15, min. 13. Alt. 7, mill. spec, from Dr. Budd's 

 cabinet. 



Diam. maj. 13, min. 11,' Alt. 7, mill. spec, from Gaston Co. 

 I^. Car., Wheatley. 



Yar. minor, anfr 5. 



