inhabiting the United. States. 393 
83, HELIX LABYRINTHICA. 
Plate XXVI. fig. 1. 
H. testa minutissimá, sub-conicd, apice obtuso, corneo-lutescente ; 
anfractibus striatis, striis distinctis, obliquis; labro incrassato, sub- 
reflexo; umbilico minimo, impresso; columellà dente laminato in 
aperturam intrante, 
Synonyms AND REFERENCEs. 
Helix labyrinthica, Say. Journ. A. N. S. Philad., 
I. 124. Nich. Encyc., Am. edit., IV. — 
Férussac. Hist. des Moll. Pl. xx., B. fig. 1. 
DESCRIPTION. 
Animal. Not hitherto observed. | 
. Shell. "Very minute, conic, apex obtuse ; epider- 
mis brownish horn-color ; whorls six, with conspicu- 
ous, elevated, obtuse, equidistant, oblique lines; lip 
thickened, somewhat. reflected ; columella with a 
long, lamelliform, raised line or tooth, which appears 
to revolve within the shell parallel to the suture, and 
sometimes a second, nearer to the base, less conspicu- 
ous, and terminating farther within the aperture; 
base flat; umbilicus small, impressed. 
Greatest transverse diameter one tenth of an inch. 
GzocRaPHICAL Distrisution.. Inhabits a wide 
range of territory ; was noticed by Mr. Say in, Mis- 
souri; is found in Vermont, and also in Massachu- 
setts. : 
Remarks. This species is of about the same size 
as HELIX rupéstris, Draparnaup, of Europe. It is 
very remarkable for the raised parallel lamine which 
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