612 W. A. TARR 
within the area of the banding. The outer part of the structures 
is usually darker than the interior. 
The remarkable thing about these structures is that in a majority 
of them the bands are not concentric. In one case the nucleus was 
EiGaer 
A, Several spheroids in one piece of tuff 
B, Spheroid showing the rings 
C, Spheroid somewhat enlarged, showing rings 
D, Three eccentric spheroids, slightly enlarged 
