44 ODONTORNITHES. 



Full measurements of the seventeenth vertebra in Hesperornis regalis 

 will be found below: 



Measurements of Seventeenth Vertebra. (No. 1207.) 



Length of centrum, 20.0 mm 



Transverse diameters of anterior articulation of centrum, 16.0-27.0 



Vertical diameters of anterior articulation of centrum, 6.0-10.0 



Transverse diameters of posterior articulation of centrum, 13.5-19.0 



Vertical diameters of posterior articulation of centrum, 9.0-13.0 



Transverse diameter of vertebra, across pre-zygapophyses, 28.0 



Transverse diameter of vertebra, across diapophyses, 1 64.0 



Transverse diameter of vertebra, across post-zygapophyses, 24.0 



Diameters of pre-zygapophyses, 12.5- 9.0 



Diameters of post-zygapophyses, 9.0- 8.5 



Length of floor of neural canal, 22.0 



Length of roof of neural canal, 21.0 



Transverse diameter of neural canal, at anterior opening, 9.5 



Vertical diameter of neural canal, at anterior opening, 7.5 



Transverse diameter of neural canal, at posterior opening, 7.5 



Vertical diameter of neural canal, at posterior opening, 7.5 



Diameters of articulation for head of rib, : 8.5- 6.0 



Diameter of articulation for tubercle of rib, 7.0 



Height of neural spine above floor of neural canal, 29.0 



Antero-posterior diameters of neural spine, 13.5-1 8.5 



Measurements. (No. 1476.) 



Length of centrum, 22.0 mm 



Least diameter of centrum, 7.5 



Transverse diameters of anterior articulation of centrum, 15.0-21.0 



Vertical diameters of anterior articulation of centrum, 5.0-10.5 



Transverse diameters of posterior articulation of centrum, 13.0-19.0 



Vertical diameters of posterior articulation of centrum, 10.0-14.0 



Transverse diameter of vertebra, across pre-zygapophyses, 25.0 



Transverse diameter of vertebra, across parapojjhyses, 21.0 



Transverse diameter of vertebra, across post-zygapophyses, 21.5 



Diameter of pre-zygapophysis, 12.0 



Diameters of post-zygapophyses, 8.5- 9.5 



Length of floor ofTieural canal, 24.0 



Length of roof of neural canal, 21.5 



Diameter of articulation for head of rib, 6.5 



Measurements. (No. 1477.) 



Length of centrum, 20.0 mm 



Transverse diameters of anterior articulation of centrum, 13.5-25.0 



Vertical diameters of anterior articulation of centrum, 5.0-10.0 



Transverse diameters of posterior articulation of centrum, 15.0-21.0 



