38 ODONTORNITHES. 



Measurements of Fourteenth Vertebra. (No. 1477.) 



Length of centrum, - 24.0 lr 



Transverse diameters of anterior articulation of centrum, 1 3.0-1 9.0 



Vertical diameters of anterior articulation of centrum, 7.0-11.5 



Transverse diameter of posterior articulation of centrum,.. 11.0 



Vertical diameter of posterior articulation of centrum, 9.0 



Transverse diameter of vertebra, across pre-zygapophyses, 39.0 



Transverse diameter of vertebra, across post-zygapophyses, 33.0 



Diameters of pre-zygapophyses, 9.0-14.0 



Diameters of post-zygapophyses, 9.0-13.0 



Length of floor of neural canal, 22.0 



Length of roof of neural canal, 15.0 



Transverse diameter of neural canal, at anterior opening, 9.0 



Vertical diameter of neural canal, at anterior opening, 8.0 



Transverse diameter of neural canal, at posterior opening, 8.5 



Vertical diameter of neural canal, at posterior opening, 9.0 



Distance between extremities of anterior and posterior zygapophyses, 31.0 



The Fifteenth Veetebea. (Plate IV, figure 6.) 



The fifteenth vertebra is shorter than the fourteenth, and of peculiar 

 shape. The centrum is deeply excavated at the sides, and its articular 

 faces are transversely elongated. Below, it sends downward and forward 

 a strong prismatic, or elongate pyramidal, hypapophysis, as long as the 

 centrum. The shaft of this process is quadrate in horizontal section, with 

 the anterior face excavated, and bearing a prominent pointed tubercle on 

 its right margin, near the end. This peculiar hypapophysis is bifurcated 

 at the extremity, and the prongs are divergent. They are somewhat 

 unsymmetrical, the left one being slightly longer than the right, and 

 directed a little more outward. 



There is no lateral foramen, but a distinct subtriangular facet for the 

 head of the first rib is borne on a short parapophysis, projecting to the 

 anterior margin of the articular face of the centrum, and somewhat below 

 it. The small rib supported by this articular face is represented in Plate 

 VIII, figure 1. The diapophyses are broken off, just below the articular 

 faces for the tubercle of the rib. The zygapophyses are rather less 

 approximate than in the preceding vertebra, and the neural spine, though 

 still rudimentary, is larger. 



