L 
426 Binney's Monograph of the Helices 
minute white teeth, radiating from the umbilicus, 
are seen through the shell, within the base of the 
. last whorl. 
Greatest transverse diameter one eighth of an inch. 
GroenaPHicAL Distrisution. Noticed hitherto 
only in Vermont, on the eastern slopes of the Green 
Mountains. 
Remarks. "This species, now described for the 
first time, possesses characters so marked, that it is 
not likely to be mistaken for any other. The nu- 
merous narrow whorls visible on its upper and plane 
surface, while only one is seen. below, together with 
its minute, round umbilieus, and narrow aperture, 
would sufficiently distinguish it; but there is another 
character still móre peculiar. There are two rows of 
very minute, delicate, white teeth on the lower side 
of the interior of the last whorl, radiating from the 
centre. One row is usually so near the aperture as 
to be seen within it with the aid of a microscope, the 
other is more or less remote; each row contains five 
or six distinct teeth. Both of them are visible through 
the shell. 'T'he transparency of the shell is so great, 
that frequently the sutures of. the upper surface can 
be seen through it when viewed on the base.. With 
the living animal within, the shell has a roseate tinge. 
42. HELIX SOLITARIA. 
Plate XXIII. 
iL testa orbiculato-convexá, latè umbilicatÀ, corneo mías 
fasciis fuscis aut rufis cincta ; — —; labro simplici d 
unicolore. 
