The posterior zygapophyses are short and massive, but otherwise correspond closely with the anterior zygapophyses, only with all the parts reversed, and except that necessarily they are relatively to the neural canal a little higher. A sharp and well defined angular ridge, commencing at the back of the zygapophysis, is directed inward, and forward, and upward along the posterior margin of the neural arch to the top of the neural spine. The posterior aspect of the neural arch is concave from side to side, and makes a right angle with the superior lateral aspect. The part of the centrum exposed behind the neural arch is convex above from side to side. The pneumatic foramen between the centrum and the neural arch varies greatly in size; it is oval and longitudinal. The largest specimens have the centrum 2-1/2 inches long; in the smallest the centrum measures 5/8ths of an inch in length. In the second type of cervical vertebra the side of the centrum makes a right angle with the base, and is separated from it by a sharp angle as in struthious birds. The side of the centrum is concave, with a few small pneumatic perforations; and the side of the centrum, which is high posteriorly, rounds over the oblique ridge connecting the zygapophyses, into the oblique lateral face of the neural arch. The anterior zygapophyses are very large and the posterior zygapophyses small and placed as high as the top of the neural canal. Every region of the vertebral column displays pneumatic foramina, situated as in the vertebræ of birds.