48 ODONTORNITHES. 



Measurements of Nineteenth Vertebra. (No, 1470.) 



Length of centrum, 26.5 mm 



Least diameter of centrum, 8.6 



Transverse diameters of anterior articulation of centrum, 15.0-23.0 



Vertical diameters of anterior articulation of centrum, 13.0-12.0 



Transverse diameters of posterior articulation of centrum, 13.0-14.0 



Vertical diameters of posterior articulation of centrum, 1 3.0-20.0 



Transverse diameter of vertebra, across #pre-zygapophyses 3 21.0 



Transverse diameter of vertebra, across parapophyses, 30.5 



Transverse diameter of vertebra, across diapophyses, 57.0 



Transverse diameter of vertebra, across post-zygapophyses, 19.0 



Diameters of pre-zygapophyses, 7.5-8.0 



Diameters of post-zygapophyses, 10.0-10.0 



Length of floor of neural canal, 27.0 



Length of roof of neural canal, 25.5 



Transverse diameter of neural canal, at anterior opening, 9.0 



Vertical diameter of neural canal, at anterior opening, 6.0 



Transverse diameter of neural canal, at posterior opening, 7.0 



Vertical diameter of neural canal, at posterior opening, 6.5 



Diameters of articulation for head of rib, 6.0- 7.5 



Antero-posterior diameter of neural spine at base, 18.0 



Measurements. (No. 1477.) 



Length of centrum, '. 24.0 rara 



Transverse diameters of anterior articulation of centrum, 1 7.0-24.0 



Vertical diameters of anterior articulation of centrum, 8.5-12.0 



Transverse diameters of posterior articulation of centrum, 15.0-24.0 



Vertical diameters of posterior articulation of centrum, 12.0-15.0 



Transverse diameter of vertebra, across pre-zygapophyses, 20.0 



Transverse diameter of vertebra, across parapophyses, ■ 30.0 



Transverse diameter of vertebra, across post-zygapophyses, 1 9.0 



Diameters of pre-zygapophyses, 7.0- 8.0 



Diameters of post-zygapophyses, 7.0- 8.0 



Length of floor of neural canal, 25.0 



Length of roof of neural canal, 23.0 



Transverse diameter of neural canal, at anterior opening, 9.0 



Vertical diameter of neural canal, at anterior opening, 7.0 



Transverse diameter of neural canal, at posterior opening, 8.0 



Vertical diameter of neural canal, at posterior opening, 6.5 



Diameters of articulation for head of rib, 6.2- 8.0 



Antero-posterior diameter of neural spine at base, 15.0 



The Twentieth Vertebra. (Plate V, figure 4.) 

 The twentieth vertebra is of about the same length as the nineteenth, 



or slightly longer, and is somewhat less deeply excavated at the sides. 



