‘inhabiting the United States. — 431 
Synonyms AND REFERENCEŚ. 
Helix perspectiva, Say. Journ. A. N. S. Philad., : 
Nich. Encyc., Am. edit., ÍV. 
Férussac. Hist. des Moll. Pl. uxxix., Sig. 7. 
Lamarck, Anim. sans Vert., 2d edit., VII. 
i 0 5 ‘teeta 
Helix parvula, ? Deshayes. Encyc. Méth., Vers, 
| . 217. Y vien colt a 
Description. i bon. di 
"Animal. Head T tentacula bluish black ; mar- 
gin and posterior part of foot white. Foot transpar- 
ent, narrow, less in length than twice = E . 
of the shell, terminating acutely. ^ - 
Shell. Very much depressed, almost discoidal ; 
epidermis reddish brown, immaculate ; whorls six, 
with numerous, elevated, strongly marked, transverse 
. striae ; suture deeply impressed ; umbilicus very much 
expanded, cup-shaped, exhibiting all the volutions ; 
aperture rounded, depressed ; lip simple, thin. 
Greatest transverse diameter three eighths of an 
inch. 
GzocnarHicAL Disrrisurion, Inhabits the West- 
ern States, and was noticed by Mr. Say in the North- 
western Territory. It is commonly supposed to exist 
in Massachusetts and other New England States, but, 
so far as my own observation extends, it is replaced 
in those States by Hzrix striatélla, the next described 
species, which it very much resembles.  . 
. Remarks. This is a common shell in those parts 
of the countrys which it inhabits. In Ohio it is 
sae ants 21 e Re 
pean > da os 
* * 
se 
* i 
en Sr 
