346 The American Geologist. December, looi 
Now living in the U. S. from ]\Iaine to Montana, thence 
to Nevada. Also in Europe. Not rare in the loess. 
-^*Pl:pa blandi (Alorsc) Binn. 
Two specimens were recently found in the loess near Iowa 
City. Tt is not rare in the western loess, and is found living 
from New Mexico to Montana. The shells usually formerly 
reported under this name are Bifidaria pentodon{?). The 
easternmost localities from which fossils have been received 
are ]\Iuscat-ine and Stockton in ISIuscatine county, Iowa. They 
were erroneously reported as P. miiscorum.'^ 
'^*\^ALLONIA GRACILICOSTA Rciflh. 
Quite common in the loess. It is common in western and 
ncirthwestern Iowa, and thence westward, where it lives in 
liig"h, dry situations. Its easternmost known station in Iowa is 
in Winnebago county. 
'''*SUCCINEA GROSVENORir Lco. {?) 
A form referable to this species is quite common in the 
local loess. The species now lives abundantly in the South, 
and in Nebraska and western Iowa, and is uniformly found 
(so far as the writer's experience shows) in situations which 
are exposed to severe drouth during at least a portion of each 
year. 
The Succineas of this group, both recent and fossil, re- 
quire further elaboration. 
It is interesting to note that the foregoing species, now 
extinct at Iowa City, all belong to the modern terrestrial fattna 
of the dry west, from Montana to New Mexico, and that only 
two species extend eastward as far as Iowa. 
2. Terrestrial species, now living at Iowa City. 
a. Species of higher, more or less exposed, and often 
rocky slopes. 
'''Vallonia parvula Sterki. 
Common on exposed rocky slopes, hence occurring in 
scattered colonies. Rare in the loess of western Iowa. 
*Leucocheila fallax {Say) Try. 
•Through the writer's error they were reported in Prof. Udden's, note on 
Hershey Ave. fossils in Leverett's Report in U. S. Geol. Sur., vol. xxxviii, p. 174, 
1899. In that list P. /j/anc/i should be substituted for P. /jji/scorum. Also in 
Udden's Report, la. Geol. Sur., vol. ix, p. 359, 1S99, where the same substitu- 
tion should be made in the Fulton township (Stockton) list. P. muscorum 
does however occur at Muscatine. 
