PLATE XXIII. 



Jurassic Dinosaurs. — Sauropoda. 



ATLANTOSAI.'RID.E . 



Page. 



Fig. 1. Sacrum of Broutosaurus excelsus Marsh; seen from below 170 



(j, first sacral vertebra : h, transverse process of first vertebra ; c, transverse 

 process of second vertebra; ri, transverse process of third vertebra; e, 

 transverse process of fourth vertebra; f,f',f", f", foramina between 

 processes of sacral vertebrae ; g, surface for union with ilium; 1, last 

 lumbar vertebra; p, last sacral vertebra. 



Fit;. 2. .Section through second vertebra of sacrum of Brontvsaurus excelsus 170 



e, cavity; g, face for union with ilium; »<■. neural canal. 

 Both figures are one-tenth natural size. 

 290 



