AM. JOUR. SCI., Vol. XXI, 188). 
Plate XVI. 
betwee 
lumbar vertebra; p, last sacral vertebr 
Sactum of Brontosaurus excelsus, Marsh, seen from below; one-tenth 
na _ size; a, first sacral vertebra; }, oe process of first vertebra ; 
d 
; d, transverse a ocess of thir 
8 rtebra; d, 
ra; e, transverse process of fourth pecan a: gf fo ramina 
esses 0 , surface 
