* 
4* 
inhabiting the United States, 423 
Shell. Depressed, very slightly Mirror, thin, - 
pellucid ; epidermis convex, shining; whorls about 
four, with very minute, oblique strie, apparent when 
viewed with a microscope; aperture somewhat 
rounded ; lip thin, acute ; umbilical region indented ; 
umbilicus moderate, well developed, round, and deep. 
Transverse diameter commonly about one sixth of 
an inch, sometimes attains one fourth of an inch. 
GEOGRAPHICAL Distripution. Has been noticed 
in nearly every part of the United States. 
Remarks. This is a very common species, in- 
habiting forests, cultivated fields, and gardens, A 
situation of which it seems very fond is in the crevices 
of wet, decaying wood. It resembles the preceding 
species in shape, but is much smaller. It resembles 
still more HELIX licida, Drar,, and Férussac - 'con- 
sidered it to be only a variety of that species. A 
comparison of the two shows distinctions which 
must, 1 think, prevent their being considered identi- 
eal. . Our shell is larger, and has its umbilicus more 
developed in proportion to its size ; the immediate 
circumference of the umbilicus is more impressed. 
In shells of the two species of the same size, the 
foreign one ‘has one more whorl. In their general 
aspect the two are so unlike, that it is easier to 
separate them than to describe their differences. 
^ ^ 40. HELIX ELECTRINA. 
Plate XXII. fig. 2 
H. testà parva, depress, umbilicatà, tenui, — anfractibus 
quatuor, striatis ; apasih rotundatá, labro simplici. - 
