THE NAUTILUS. 119 
tion and figure in Binney’s work represent this species, and conse- 
quently are the first authentic publication, Thus, in my opinion, 
we have to write: P. arizonensis Binney. 
Pupa holzingeri Sterki. 
This species has a very wide range of distribution in the north- 
west and west. I found 2 exa. among Pupidae from Helena, Mont., 
sent by Mr. T. B. Elliott, and one in the lot already mentioned 
from Albuquerque, N. M., not much different from Illinois exa. In 
this regard it seems to resemble its relatives, P. contracta and also 
armifera which are remarkably constant ail over the country, 
while some other species show a decided variability even in the same 
place. 
Pupa curvidens Gould. 
From my studies, during about 5 years, of my own exa. (22 lots 
of curvidens 34 of pentodon from all over the country) and a good 
many other collections, altogether thousands of specimens, I became 
satisfied that this species is to be taken up and separated from P. 
pentodon Say. It is smaller, almost always more slender, and the 
whorls are more slowly increasing, so that the last is relatively smaller 
and less predominating than in pentodon. Quite generally, there is, 
on the palatal wall near the aperture, a marked crest, and behind that 
an impression, deepest at the place of the inferior palatal lamella. 
The lamellz are nearly the same in both, and decidedly variable as to 
their number (except the typical, apertural, columellar, basal and 
the two palatals) but by far more so in curvidens than in pentodon. 
A marked difference is in the station of the two. While pentodon 
prefers low, moist localities, in company of Vertigo ovata, most 
Hyalinias, the tumid, smooth form of Carychium (exiguum Say), 
oe 
curvidens is found more in “upland” places, even on banks, steep 
slopes, together with Vert. bollesiana Morse, Hyalinia exigna 
Stimpson and the slender, regularly striated Carychium, where rarely 
or never a Vertigo ovata will be found. It is our commonest Pupa, 
here and in other parts of Ohio. P. cincinnatensis Judge is identical 
with it. 
Ona gravelly bank at New Philadelphia there is a peculiar form of 
our species; long, slender, nearly eylindrical, with only 5 typical 
lamelle, no accessory ones ; the color is somewhat greenish, and in 
weathered specimens not so white as in the type. The same form 
has been collected at Sewanee, Tenn., by Mr. Sanderson Smith, with 
