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= 
. JOURN. SCI., Vol. XIX, 1880. Plate X 
Fi igure 1.—Dermal spine of Stegosaurus ei Marsh; a. side view; 4, front 
Fi view; c, section; d, inferior view of b 
agen 2. — ash dermal spine of same in 
individual; b, posterior view; other 
Fi igure 3 o Fiat epee al spine of same ; letters as in figure 
igure 4. —Tubercular spine of same species; 4. superior view ; 6, inferior view : 
¢, fore and aft view 
All il the figures are one-twelfth natural size. 
