SYNOPSIS OF THE VERTKBRATK FAUNA OF THE PUERCO SERIES. 313 



Measurements of Skull. M. 



{anteroposterior (oblique) 015 

 transverse (oulique) <Ji- 



Lengths of p. m. iii and iv Old 



" " seven inferior molars 053 



I anteroposterior 085 

 tn»nsverse 072 

 vertical 0'"'0 



{to condyle 070 

 l\-r 

 to angle 0^><' 



f anteroposterior 054 



Diameters of coronoid \ „ , . 



[ vertical 044 



Width of condyle 017 



Depth of ramus at coronoid 081 



' m. iii 034 



" " " "p.m.iv 042 



Vertical depth of sagittal suture 027 



Only cei'vical vertebriB are preserved. These have small anteroposterior diame- 

 ter, and their transverse exceeds their vertical diameter. In general .they resemble 

 those of Periptychus. The atlas is peculiar in the small anteroposterior diameter of 

 the paradiapapohysis, whose base is perforated by an anteroposterior canal. It sends 

 upwards a vertical keel to opposite the middle of the facet for the axis. The axis has 

 a cylindric and rather slender odontoid process whose superior extremity is obliquely 

 beveled on a curve. Its articular surface is continuous with the large atlantal facets 

 laterally and inferiorly. The longitudinal axis of the cervical centra is oblique to the 

 horizontal, showing that the head was elevated above the body. The llooi- of the 

 neural canal is pierced by a foramen of considerable size on each side. A posterior 

 (? seventh) cervical has a greater anteroposterior diameter than the two which pre- 

 cede it, and the vertical diameter is relatively greater. The posterior aiticular face 

 of all three is slightly concave. 



JUeasuremenis of Vertebrw. ^^f- 



Anteroposterior diameter of atlas 020 



Width of axis at atlantal facets 0;!8 



Length of odontoid process "1 1 



I anteroposterior 0085 

 vertical 010 

 transverse 02C 



f anteroposterior Oil 



Diameters of centrum cervical ? v | vertical 015 



(. transverse 029 



f anteroposterior 01.) 



Diameters of centrum cervical ? vii J vertical 010 



I. transverse Oi.8 



