JV^orth American JlelicidcB. 91 



and acutely reflected, and at its junction below with the pillar 

 lij) more closely appressed to the last whorl. 



This shell Las generally a more or less developed internal 

 lamina, commencing on the parietal side of the inner fourth of 

 the last, and running round rather obliquely within from two- 

 thirds to three-fourths of the penultimate whorl, — revolving in 

 fact nearly once round the shell. 



In some specimens the penultimate whorl below is partially 

 covered by the hist, as in septeTnvolva. 



This species, which I consider distinct from JI. septemvolva 

 Say, has from 7 to 8 whorls, and measures as follows : — 



Diam. maj. 14, min. 12^, Alt. 3|- mill, (large specimen.) 

 " " 9, " 8 " 2i " (small do.) 



Dr. Gould (Terr. Moll. Yol. III. p. 31) refers to the vertical 

 series on Plate XXXYIII as reprenting the typical form of JI. 

 septemvolva Say, but the lower figure, showing the base, is cer- 

 tainly not of the shell described by Say, rather of that which 

 I call II. cereolus. 



Helix Carpeiatcriaiia, noT. sp. 



SYNONyMY. 



Helix microdonta Pfr. Mon. 1. p. 499 ex-parte? 1848. 



W. G. Binney, Notes on Amer. Land Shells, 



Phila. Proc. 1858. 



— « SupplTerr. Moll. p. 91, 1859. 



T. nmbilicata, orbiculata, cornea vel pallide rufescente, superne plana, 

 oblique et argute costulata, subtus convexa, leviter striata, nitida, 

 maculis opacis, indistinctis, sa^pe ornata; sutura valde impressa; anfr. 

 5|— 6^, ultimo ad peripheriam superne subangulato, ad aperturam breviter 

 sed subito deflexo, gibbosulo, scrobiculato-constricto, pone aperturam 

 tumido, costulato, basi dilatato, lamina interna alba in pariete columel- 

 lari, pone aperturae insertionem sita ; apertura perobliqua, lunari ; perist. 

 intus calloso, incrassato, reflexiusculo, marginibus lamella dentiformi 

 triangulari junctis. 



