1881.] 1^' [Cope 



front, and truncate behind. The posterior face lias several longitudinal 

 wrinkles, including a median raised line, and there are some more irregu- 

 lar wrinkles on the sides. 



Measure merits of vertebrce> M. 



Anterior face of os dentatum ( wulth 02;j 



I depth (oblique) 012 



(width 020 



Posterior face of os dentatum 



l depth 018 



Length os dentatum above 014 



(posterior face [ de ^ h 032 



Diameters axis I I width 020 



( length 0185 



Hypapophysial facet os dentatum I * 



3V v F J • 1 width 014 



r length 022 



Diameters fourth cervical < . . f depth 0225 



) anterior i / • „„„ 



' I width 022 



r length 0215 



Diameters sixth cervical < „„+„,.-. f depth 0245 



j anterior < ^ 



I I width 0235 



Spaces between parapophysis and diapophysis of do 0040 



/ length 0265 



Diameters of dorsal 1 anter : or / depth 0260 



( I width .0265 



Height of neural spine of?, from postzygapophysis 0210 



Anteroposterior width of do. at base 0100 



The portions of ribs are separated heads and shafts. The former are 

 double and therefore cervical, and are quite large. If the shafts belong to 

 them, the neck of this species must haA~e been wide. The shafts are slender 

 and are of dense bone. The section is oval at the middle, but towards 

 the distal extremity becomes flattened and grooved and delicately line 

 ridged on one side. The extremities of the long bones are without con- 

 dyles but have concave surfaces like those of the ribs. The bodies are ro- 

 bust and angular. They may be abdominal ribs of unusual stoutness. 

 From the Puerco beds, D. Baldwin. 



Published Febbuaby 20th, 1882. 



