^ 
432 ` Binney’s Monograph of the Helices 
particularly abundant, vast numbers of them being 
sometimes found under the bark of a single decaying 
tree. The striz of increase on the upper surface are 
remarkably prominent, and almost angular, and serve 
. to distinguish it from every other species; on the 
lower surface they are very distinct, but less promi- . 
nent, and the direction of their curve is the reverse 
of that above; they converge into the umbilicus. 
It varies considerably in size, and young shells are - 
' often carinated. In mature individuals there is a 
single sub-prominent tooth on the base of the shell 
within the aperture. It resembles HELIX rotundata, 
MUtter, but is destitute of the alternate. markings of 
at species. There cannot be a doubt that Hexix 
la, DesHayes, is identical with this shell, as his : 
description will not apply to any other than this and 
the following species, and the angulated character 
of the stri sufficiently point to this. 
There is à Hxrrx described under the same id. 
name by Waaxzn, in S pix's T'estacea of Brazil; but, 
-as this did not appear until ten years after Mr. Say’s 
publication, a new name must be adopted for the 
Brazilian species. 
. 45 HELIX STRIATELLA.. 
Plate XXL fig.5.. 
H. testa parva, orbieulato-depressà, tenui, latè umbilicata, corned ; 
=n convexis, obliqué. et minuté striatis; asit: 
undatà ; labro tenui, aiuto, sa oon d M 
— AND REFERENCES. 
Helix striatélla, Anthony. Bost. Journ. Nat. His, 
III. 27 M 
E: 
