108 THE CERATOPSIA. 



Measurements. 



Mm. 



Length of the nine posterior dorsal vertebras. 0. 880 



Length of the nine sacral vertebra?. (36} inches) : , 930 



Length of right ilium (2 pieces, 0.84-0.22), (41 inches) .. 1. 060 



Length of eighth dorsal from the sacrum . 090 



Length of the base of the neurapophysis . 085 



Depth of the articular face . 153 



Width of the articular face ". 123 



Length of the second from sacrum . 070 



Depth of the articular face 155 



Width of the articular face , 137 



Elevation of the neural canal 045 



Width of the neural canal 028 



Elevation of the face of the zygapophyses . 104 



Elevation of the base of the neural spine. 150 



Length of the diapophysis from the lower base 200 



Length of the diapophysis from the capitular articulation : . 125 



Antero-posterior width above. .... 050 



Antero-posterior width of the base of the neural spine . . 070 



Antero-posterior width at the zygapophysis 078 



Length of the neural spine (fragment) ... . 200 



Width of centrum of the first sacral 160 



Depth of the centrum of the first sacral (to the neurapophysis) 145 



Length of the centrum of the first sacral. . . 100 



Length of the centrum of the seventh sacral . _ . 100 



Depth of the centrum of the seventh sacral (behind) 085 



Width of the centrum of the seventh sacral (behind) . . 100 



Expanse of the second sacral transverse support (22 inches) 560 



Length of the ilium anterior to the acetabulum -■- - « 470 



Length of the acetabulum 200 



Length of the ilium posterior to the acetabulum . 390 



AVidth of the ilium at the anterior extremity. . 140 



Width of the ilium at the front of the acetabulum 210 



Width of the ilium at the posterior expansion . 250 



Thickness above the acetabulum . 060 



Width of the acetabulum 105 



Width of the bases of the ischium. . 085 



Width of the shaft of a rib j. .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. 



MATERIAL NOW AVAILABLE. 



Of this material there remains accessible only the right ilium and a mere fragment of the 

 anterior extremity of the left, one rib nearly complete but lacking the capitulum and the distal 

 extremity, a proximal portion of a second rib without either capitulum or tuberculum. The 

 sixteen vertebrae mentioned by Cope consist of the nine posterior dorsals, for the most part 

 represented only by centra. There are, however, three complete but detached neural arches. 

 One of these still supports the transverse process of the left side and this shows at its extremity 

 the tubercular rib facet, while the capitular rib facet may also be seen on the inferior border, 

 near the point where the transverse process unites with the neural arch. There is also pre- 

 served a left one-half of a fourth neural arch, which likewise bears a transverse process, com- 

 plete except at the very extremity, where the tubercular facet is wanting. In the second 

 from the anterior dorsal of the series figured by Cope the neural arch is still in position. It 

 shows only a sutural union with the centrum, being held in position by the inclosing matrix. 

 Both transverse processes, as well as the neural spine, are wanting in this and the three pos- 

 terior dorsals figured \>j .Cope. The sacrum which he has described as being perfect and 

 consisting of five, sometimes eight or perhaps nine, vertebrae is also present. The three centra 

 of the anterior caudals or sacro-caudals are present in identically the same condition as figured 



