392 The American Geologist. Decern Ikt, i»i<T 
Figure 4. Longitudinal median section, showing the central tube 
or cloaca, and the septa, with the perforations in both. 
Figure f). Fragment of a smaller specimen with a less cc^nstricted 
cloaca. 
Figure 6. Cross-section, showing the jjerforated outer and inner 
walls. 
All the above figures are natural size . 
Figure 7. Cross-section enlarged, showing the oblique laminie cross 
ing the interseptal spaces and forming a coarse vesicular tissue. 
Figure 8. Enlargement of a portion of the cloacal wall and septum . 
Figure 9. Median cross-section of an interseptal cavity, .showing the 
curving lamina;: enlarged. 
ON GLACIAL DEPOSITS IN THE DRIFTLESS AREA. 
By F. VV. S.\EDEsON, University of Minnesota. 
The "driftless area" of Wisconsin, Iowa and Minnesota 
has been believed, as the name implies, to be entirely devoid 
of glacial deposits. It is doubtless devoid of "northern drift,'' 
and this fact is worth expressing in the name of the area 
whether or not it has local drift deposits upon it. The name 
need not imply that there never existed Pleistocene glaciers 
within the area's borders, although such is indeed asserted 
to be the case by American glacialists. I shall use the name 
herewith the reservation that "driftless" means without north- 
ern drift. I may explain briefly, that a former teacher. Prof. 
G. Steinmann, had told me, that from knowledge of other 
continents he should deduce the theory that the driftless area 
of Wisconsin has been occupied more or less by local glaciers : 
and while working a few days in this region last August, I 
have indeed found some deposits which I cannot explain as 
anything but local glacial moraines, and which would certainly 
not be called anytliing else if found in drifted regions. - 
My opportunity for study of this " driftless area " has been 
limited and I shall not therefore attempt to maintain any 
theory of its glaciation, nor to present a description of its 
Pleistocene deposits, except to describe some of them in con- 
nection with certain non-glacial deposits of the drifted regions 
which appear also to be important factf)rs in the study of the 
Pleistocene. It was mainly for the purpose of explaining the 
latter that my visit to the '• driftless area" was undertaken. 
These same non-glacial deposits associated with the northern 
