Se ee eee te 
Figure 1.—Left — of Creosaurus atrox Marsh; seen from the left. 
Fi 
a. anterior, or ae a wrtioulation’ b. — ior, or ischiadic, articulation; 
I articular facet on front of pubic pr 
Figure 3.—Lumbar vertebra of Allosa on ss frapske inert front view. 
agi 1 _—The same; side view, from the left. 7. th one-sixth natural size. 
’ Bi 
_ AM. JOUR. SCI., Vol. XVII, 1879. Plate X. 
gure 2.—The same; seen from below. Both one-tenth natural size. 
anterior articular face posterior articu agi hinelers . neural § spine ; 
d diapophyai: z, anterior : eygapophysin; 2’. posterior zygapophysis. 
