138 Hemarhs on Certain Species of N. A. JlelicidoB. 



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

 lip more closelj appressed to the last whorl. 



This shell has 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 last, as in septemvolva. 



This species, which I consider distinct from 11. septemvol'va 

 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 XXXVIII as reprenting the typical form of H, 

 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 H. cereolus. 



Helix CaiT)€iitcriaiia nov. sp. 



Synonymy. 



Helix wwcroc?onta P/r. Mon. 1. p. 499 ex-parte? 1848. 



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



Phila. Proc. 1858. 

 . " Suppl. Terr. Moll. p. 91, 1859. 



T. umbiheata, orbiculata, cornea vel pallide nifescente, superne plana, 

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

 maculis opacis, indistinctis, ssepe 'ornata ; sutura valde impress^ ; anfr. 

 5i_6i, nltimo ad periplieriam superne snbangulato, ad aperturam breviter 

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

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

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

 intus calloso, incrassato, reflexiusculo, inarginibus lamella dentiformi 

 triangular! juuctis. 



