50 ODOXTORXITHES. 



Transverse diameter of vertebra, across post-zygapopkyses, 21.0" 



Diameters of pre-zygapopkyses, 10.0- 8.0 



Diameters of post-zygapopkyses, 9.5- 9.0 



Lengtk of floor of neural canal, 26.0 



Lengtk of roof of neural canal, 23.5 



Transverse diameter of neural canal, at anterior opening, 8.0 



Vertical diameter of neural canal, at anterior opening, 6.0 



Transverse diameter of neural canal, at posterior opening, 7.5 



Vertical diameter of neural canal, at posterior opening, 6.2 



Lengtk of kypapopkysis, 5.0 



Diameters of articulation for kead of rib, 8.0- 6.4 



Diameter of articulation for tubercle of rib, 7.0 



Heigkt of neural spine above floor of neural canal, 34.0 



Antero-posterior diameters of neural spine, 1 7.5-23.0 



Measurements. (No. 1476.) 



Lengtk of centrum, 26.0 n 



Least transverse diameter of centrum, 9.0 



Transverse diameters of anterior articulation of centrum, . 14.0-22.0 



Vertical diameters of anterior articulation of centrum, 12.5-13.0 



Transverse diameters of posterior articulation of centrum, 14.0-22.0 



Vertical diameters of posterior articulation of centrum, 13.0-15.5 



Transverse diameter of vertebra, across pre-zygapopkyses, 20.0 



Transverse diameter of vertebra, across parapopkyses, 27.5 



Transverse diameter of vertebra, across post-zygapopkyses, 17.0 



Diameters of pre-zygapopkyses, 8.5-10.5 



Diameters of post-zygapopkyses, 8.5-10.0 



Lengtk of floor of neural canal, 27.0 



Lengtk of roof of neural canal, 23.0 



Transverse diameter of neural canal, at anterior opening, 8.0 



Vertical diameter of neural canal, at anterior opening, 5.5 



Transverse diameter of neural canal, at posterior opening, 8.0 



Vertical diameter of neural canal, at posterior opening, 5.5 



Diameters of articulation for kead of rib, 7.0- 8.0 



Antero-posterior diameter of neural spine, at base, 19.0 



The Twenty-first Vertebra. (Plate V, figure 5.) 



The twenty-first vertebra is slightly longer than the twentieth, and 

 the centrum is stouter, and less excavated at the sides. The hypapophysis 

 is short and weak. The parapophyses are very short, so that the articula- 

 tion for the head of the rib is scarcely raised above the general surface of 

 the vertebra. It is situated nearly on a level with the neural canal, but 



