288 
IOWA ACADEMY OP SCIENCE 
TABLE OP MOi^LUSCA-Continued 
1 
2 
3 
4 
5 
6 
Vertigo sp. ........... . 
+ 
Sphyradium edentulum 
(Drap.) Sterki 
+ 
+ 
Woods, under leaves, etc. 
Succinea oblonga Pfr. . . 
+ 
+ 
T* 
-f 
+ 
Under wood, etc., often 
in dry places. 
Succinea putris L. . . . . . 
+ 
+ 
+ 
+ 
Damp woods, meadows. 
etc. 
Succinea pfeifferi Rossm. 
+ 
Low, wet places. 
Lymnsea truncatula 
Muell. 
+ 
Small streams and stag- 
nant waters. 
Valvata piscinalis Muell, 
+ 
Small streams and ponds. 
All of these species now live in the same general region. 
EXPLANATION OP PLATE XXXI. 
Pig. 1. Cut in brickyard at Peczel, Hungary, showing the following: 
a. I Yellow loess, resting unconformably on h; 1245 feet. 
b. Horizontally stratified deposit consisting of alternating bands 
of silt and sand with small pebbles. 
c. The portion of b in which the largest number of shells was 
found, chiefiy in sand pockets. 
x~x. The line between a and b. 
Pig. 2. Cut east of the preceding: 
a. Yellow loess; 842 feet. 
b. Silt and sand, horizontally stratified, containing fragments of 
shells. 
Botanical Laboratory^ 
State University of Iowa. 
