TO Remarks on Certain Species of 



adopt the name suggested by liitn in correspondence with Say. 

 He informs me that many years ago he collected specimens, 

 and thinking the shell undescribed, forwarded some to Say, 

 with the following label, which is still in his possession, "H. 

 avara Say ? probably new, if so call it H. espiloca." Say con- 

 sidered them to be avara.^ 



Seeing that Say pronounced this species and H. Postelliana 

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

 quoted by me, Annals Vol. YII. p. 31, but still am under the 

 impression that he could not have seen the shell described by 

 Say as H. avara. 



Helix introferens, nov. sp. 



Plate IV. fig. 3-4. 

 T. uinbilicata, depresso-globosa, tenuiuscula, costulato-striata, corneo- 

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

 ad aperturam valde constricto, bicrobiculato, ad peripheriam subaiigulato, 

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

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

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

 basali dente lamelliformi submarginali, in medio transversim tuberculato, 

 instructo ; dente inferiori intra aperturam producto, tuberculum validum 

 form ante. 



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

 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. 



* See Extracts from Dr. Ravenel's letters at page 11. I am indebted to Mrs. 



Say for specimens of H. Postelliana, with label " Helix ? Swamps of S. Car. 



written by Dr. Ravenel, with the specific name " avara S " added by Say. 



