Ec 
‘aph of the Helices . 
for Pide species. The 
n its. ape ty eral usi 
Es destrowing them, that I have 
ed. to keep them by themselves. This 
rey ef et by inserting their narrow bodies, which 
they have the power of elongating and protruding 
i very far from their own shells, into the shells of 
their vietims, and then feeding upon them at their 
leisure. It burrows in the soil under decaying logs. 
The first published description of this shell was 
| a Mt, Say, in 1821, under the name of Hzrix cón- 
cava. „Férussac noticed it (without description) in 
een in his * Prodromus, No, 211," as Hex pla- 
norbóides, and afterwards. gave a figure of it under 
the same name. Mr. Say’s name, has. therefore the 
right of priority, and is universally adopted in this 
country. Férussac quotes Rafinesque for the specific 
name in this case,.as well as in some others; but it 
is not known when or where his descriptions were 
published. In 1839, a second description, with a 
figure, under the name of HELIX. Vancouvertnsis, 
was ` published by Mr. Lea, from large indiyiduals 
brought from Oregon Territory, on the supposition 
that they belonged to a new species. After careful 
examination, I am not able to. perceive any differ- 
ence between the two except that of size. The 
specific character on which Mr. Lea relies, Viz. the 
“ remarkable ” depression of the upper part of the 
lip, and the callus uniting the upper and lower tet 
minations of the lip, are common in specimens. of 
Hex cóncava. froni various parts of the United 
