[parks] 



NEW SPECIES OF TRACHODONT DINOSAUR 



53 



Height of head from lower edge of dentary to 



highest point of squamosal 



Breadth between upper rim of orbits 



Height of quadrate 



Length of supratemporal fossa 



Width of same 



Height (oblique) of lateral temporal fossa 



Width (horizontal) of same , . . 



Height (oblique) of orbital opening 



Width (horizontal) of same 



Length of frontal on median line 



Length of lachrymal 



Width of same on orbital edge 



Premaxillary-lachrymal suture 



Prefrontal-lachrymal suture 



Width of lower part of occipita' condyle 



Width of same across the upper trifid portion . . 



Height of foramen magnum 



Width of same 



The Neck 



The head of the animal was so strongly thrown backward, either 

 in the death throes or afterwards, that the neck is abnormally flexed, 

 so much so that the zygopophysial facettes are pushed quite past one 

 another. The total length, in this flexed position, of the thirteen 

 cervical vertebrae is 3 ft. 6 in. 



The atlas is composed of four pieces: a curv^ed intercentrum, a 

 sub-spherical odontoid, and two fairly stout neural arches laterally 

 expanding into transverse processes and dorsally into a spine which 

 is nearly as high as the crest-like spine of the axis. There is, apparent- 

 ly, no cervical rib. The axis is a normal vertebra except for the long 

 and crest-like neural spine which is 170 mm. long and 55 mm. high. 

 The cervical rib is very slender and thin, and longer than those im- 

 mediately posterior to it (100 mm.). 



The remaining cervical vertebrae are strongly opisthocoelous. 

 The neural spines, from the third to the thirteenth vertebrae, gradually 

 increase from 20 to 120 mm. in length, and the diapophyses from 20 

 to 140 mm. The cervical rib of the third vertebra is 80 mm. long and 

 that of the eleventh 145 mm. 



