THE NAUTILUS. IIM 



tion and figure in Binney'i^ work represent tliis 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 distril)uti()n in the north- 

 west and west. I found 2 exa. among Pupidae fiom Helena, ^Nlont., 

 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 

 arviifera 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 jjentodon from all over the country) and a good 

 many other collections, altogether thousands of si)ecimens, 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 hi 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 lamellae are nearly the same in both, and decidedly variable as to 

 their number (except the typical, apertnral, coluraellar, 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 8ay), 

 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 Caiychium, 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. 



On a gravelly bank at Xew Philadelphia there is a peculiar form of 

 our species ; long, slender, nearly cylindrical, with only 5 typical 

 lamellae, 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., bv Mr. Sanderson Smith, with 



