446 GEOLOGICAL SURVEY OF THE TERRITORIES. 



the tentli sacral, there is no such process, but its neural arch and that of 

 the ninth support transverse processes. These are more like those of 

 the dorsals in having three strong basal supporting ribs, the anterior 

 and posterior extending for some distance along the arch. 



Whether naturally or in consequence of distortion, the plate of the 

 ilium is at a strong angle to the vertical axis of the acetabulum ; and at 

 the posterior part of it, the margin of the plate is free on the outside as 

 well as the inside of the femoral articulation. 



31easurements. 



AT. 



Length of nine posterior dorsal vertebrae 880 



Lengtli of nine sacral vertebrae, (36f inches) 9C0 



Length of right ilium, (two pieces, 0.84+0.22, 41 inches). 1.060 



Length of eighth dorsal from sacrum 090 



Length of base of neurapophysis 085 



Depth of articular face 153 



Width of articular face 123 



Length of second from sacrum 070 



Depth of articular face 155 



Width of articular face 137 



Elevation of neural canal 046 



Widtb of neural canal - 028 



Elevation to face of zygapophysis - 104 



Elevation to base of neural spine 150 



Length of diapophysis from lower base .' 200 



Length from capitular articulation 125 



Antero- posterior width above 050 



Antero-posterior base of neural spine 075 



Antero-posterior width at zygapophysis 070 



Length of neural spine, (fragment) 208 



Width of centrum of first sacral 160 



Depth of centrum of first sacral, (to neurapophysis) 140 



Length of centrum of first sacral 105 



Length of centrum of seventh sacral 100 



Depth of centrum of seventh sacral, (behind ) 080 



Wid h of centrum of seventh sacral, (behind) 103 



Expanse of second sacral transverse support, (22 inches).^ 560 



Length of ilium anterior to acetabulum 470 



Length of acetabulum 200 



Length of posterior to acetabulum St)0 



Width of ilium at anterior extremity 140 



Width of ilium atfrontof acetabulum- 210 



Width of ilium at posterior expansion 250 



Thickness above acetabulum 060 



Width of acetabulum lOO 



Width of basis of ischium , 085 



Width of shaft of a rib 062 



Other bones not yet determined will be included in the description in 

 the final report. 



This species was no doubt equal in dimensions to the largest known 

 terrestrial saurians or mammals.- 



HADEOSAURUS, Leidy. 



[Cretaceous Reptiles of the United States, 1865, 76 ; Proceedings of the Academy of 

 Natural Sciences, Philadelphia, 1856, 218.] 



Hadrosaurus occidentalis. Cope, Extinct Batrachia, &c., p. 9S; 

 Thespesiiis occidentalis, Leidy, Proceedings of the Academy, Philadel- 

 phia, 1856, 311 ; Transactions of the American Philosophical Society, 

 1860, 151. 



From the lowest member of the lignite formation at Grand Eiver, Ne- 

 braska. 



