He N Mes: 
VOL. III. DECEMBER, 1889. No. 8 
DESCRIPTION OF A NEW AMERICAN HELIX. 
BY F. A. SAMPSON. 
On the Boston Mountains, Crawford Co., Arkansas, I found some 
shells which may be described as follows: 
Triodopsis edentata, n. sp. 
Shell imperforate, depressed, with granulate striations, thickly 
covered with hair-like projections; whorls 5, the last strongly con- 
tracted at the aperture ; suture not much impressed ; spire short, 
obtuse; parietal wall with a long arcuated white tooth ; 
umbilical region impressed; aperture contracted by a 
Tt deep indentation behind the peristome; on the inner 
margin of the peristome are two enlargements or obsolete 
teeth, one near the base, the other midway between it 
and the right terminus of the peristome. 
Greater diameter 133, lesser 12, height 7 mill. 
T. inflecta in Arkansas varies from 9 to 12 mill. diameter, and the 
larger shells in general appearance are very much like this species 
with the exception of the teeth on the peristome. Had I found but 
one or two specimens I would have taken them to be immature 
inflecta of large size, but I found a dozen living and dead shells the 
latter part of February, and they were all destitute of peristome 
teeth, and are as much entitled to specific distinction as Triodopsis 
Rugeli Schutt, in which the difference from inflecta is the distance 
of the upper tooth of the peristome within the aperture. 
In this species the enlargements of the peristome correspond in 
position with the teeth of inflecta, but it is hardly proper to call 
