8 



M. 



t^. . e (vertical 310 



Diameter of cup < 



i transverse 160 



Length of parapophysis 095 



Width of neural canal 063 



The dorsal vertebra which I suppose to be the anterior one of those re- 

 ceived is characterized by its undivided transverse neural spine. The en- 

 tire neural arch is of enormous elevation, but as the zygapophyses are 

 above its middle, the neural spine is not as long relatively as in various 

 other genera, or as in the caudals of this one. The sides of the centrum 

 are strongly concave, and tbe borders of the cup flaring. The neural arch 

 is everywhere excavated, so as to reduce the bulk, and produce lightness 

 so far as consistent with strength. The diapophyses rise from a point above 

 the neural canal, and are directed upwards as well as outwards. 

 It sends a narrow ridge down to the sides of the centrum, on each side of 

 which its shaft and base are deeply excavated. The posterior of these fossse is 

 overlooked by the wide zygapophysis ; and the roof of the anterior one sup- 

 ports the anterior zygapophysis. The former are separated by another and 

 vertical septum, which bifurcates below, forming two prominent borders of 

 the neural canal. At each side of the base of the neural canal there are 

 two trilateral fossse, of which the anterior is much the larger, and extends 

 higher up on the lateral edge of the spine. They are separated by a lam- 

 ina. The diapophysis is not very long, and is subtriangular in section near 

 the extremity. The neural spine is thickened at the extremity as though 

 for the attachment of a huge ligament. At the summit of its posterior basal 

 fossa, at the middle of its height, is an outwardly curved process with a 

 smooth, extero-superior face. 



Measurements. M. 



. Length of centrum 275 



Total elevation of vertebra 830 



Elevation to posterior zygapophyses 550 



" of superior edge of diapophyses above centrum .350 



" of neural spine above posterior zygapophyses.. .295 



Length of diapophysis behind 215 



Depth of extremity of do. (restored) .075 



Transverse extent of summit of neural spine 215 



" " neural spine at middle 330 



Another dorsal vertebra is better preserved than the last described. It 

 is distinguished by the lack of the median portion of the neural spine and 

 the extension outwards, of the median lateral processes described above. 

 The diapophyses are much larger, and the zygapophyses more extended 

 transversely. The centrum is constricted at the middle, and especially 

 just behind the convex articular extremity, whose circumference forms a' 

 prominent rim. The edges of the lip are flared outwards, forming a deep 

 basin, much wider than deep. The fossae described in the last vertebra 



