AM. JOUR. SCI., Vol. is 1881, Plate X. 
2a. 
FIGURE 1.--Cervyical vertebra wd be urus fragilis Marsh; front view. tv. 
side view; 1b. transverse sec of same vertebra. ; : 
Figur" 2.—-Dorsal vertebra ee Calera fragilis; front view. 2a. side view ; 
2b. transverse sec f sa 
FigurE 3.—Caudal vertebra of Colurus fragilis; front view. 3a. side view; 
3b. transverse section of same. 
%. anterior; p. posterior; c. cavity; f. lateral foramen; ne. — canal; 7. 
coossified rib; s. neural spine; 2. anterior zygapophysis; 2’. posterior 
zy gapophysis. ; 
All the figures are of the natural size. 
