AM. JOURN. SCI., Vol. XXI, 1881. Plate VII. 
Figure 1.—Sacrum and ilia of Stegosaurus ungulatus, Marsh, seen from below. 
One-twelfth ra size. a, first sacral vertebra; 0, phepioes erse process 
acral vertebra ; e, transverse process of same; /, second 
of sam 
lumbar vérebra on sacrum; /’, lumbar vertebra eet to sacrum; 7, 
pulum 
— Anterior Fan vertebra of Stegosaurus ungulatus, side view ; one- 
eighth mitim 
—Sam 
fron eural spine; 2, anterior zyga- 
oksee. Zz, sfasreised zpeapophysie; . transverse process; », neural 
canal ; ¢, face for chevron. 
