AM. JOUR. SCI., Vol. XXI, 1881. Plate XV. 
Figure 1.—Dorsal vertebra of Brontosaurus eacelsus, Marsh, side view. 
2.—The sam oO a 
FIgurE 2 ze. 
The signification of the letters in h s is as follows: }, ball; ¢, 
cup; d, diapophysis ; J, foramen in centrum; ”, neural canal; p, parapophy- 
Sis ; bad neural spine; 2, anterior zygapophysis ; 2’, | gamelan! gapopl ot bree 
3.—Section through second vertebra of sacrum of 
ppt sus, one-tenth n —— size; ¢, cavity; . surface far union with 
ilium ; nc, neural canal. 
