406 Binney’s Monograph of the Helices 
Synonyms AND REFERENCES. 
Helix intérna, Say. Journ. A. N. S. Philad, 
IL 155 
Helix Pomum-Adami, DEN Cabinet of Natural 
History. 
DESCRIPTION. 
Animal. Not hitherto observed. ' 
Shell. Depressed, slightly convex; epidermis 
reddish-brown, shining ; whorls eight, with regular, 
equidistant, elevated, oblique stri, separated by dis- 
tinct grooves; suture deeply: impressed ; aperture 
flattened, transverse, narrow ; lip thin,’ acute, thick- 
ened internally ; within the aperture, on the outer 
lip somewhat distant from the margin, are two 
prominent, lamelliform, white teeth; base smooth, 
polished ; umbilical region indented. 
Greatest transverse diameter one fourth of an inch. 
GeocrapuicaL Disrrisution. Inhabits ‘Ohio, 
Missouri, and the western parts of Pennsylvania and 
Virginia. It will probably be found in all the 
Western States. 
Remarks. This is a beautiful as + well as à a very 
distinct species. Its uniform shining teddish brown 
color is peculiar to it. Its numerous narrow whorls 
increasing almost Wipereptibly. in width. from the 
found a a I slicahd adopt the presence or absence. of teeth 
ure. 1 include in this section those species in whieh the 
umbilicus is wholly or nearly obsolete in its most mature and perfect 
. state, although in a younger stage of growth it may be well n 
