THE DORSAL VERTEBH.E. 81 



The first dorsal in the type specimen of Tinoeeras anceps (number 

 1030) is shown in fignres 97 and 98,-on j^age 80. In other sjiecimens 

 of Tinoeeras, this vertebra presents the same general characters. 



The principal dimensions of a first dorsal vertebra of Dinoceras, and 

 of this vertebra in the tvj)e specimen of Tinoeeras, are given below. 



Measurements of First Dorsal Vertebra. {^Dinoceras ndrabile. No. 1255.) 



m. 



Length of centrum, along floor of neural canal, .048 



Length of centrum, along inferior surface, .058 



Vertical diameter of anterior face of centrum, .072 



Transverse diameter of anterior face of centrum, .075 



Vertical diameter of posterior face of centrum, .073 



Transverse diameter of posterior face of centrum, .. .073 



Vertical diameter of neural canal, .. .046 



Transverse diameter of neural canal, .065 



Greatest diameter, across transverse processes, _ _ .210 



Diameter of pre-zygapophyses, .0.30 



Distance across pre-zygapophyses, _.. 140 



Diameter of post-zygapophyses, . .03 1 



Distance across post-zygapophyses, .115 



Diameters of anterior face for head of rib, .030-.03S 



Diameters of posterior face for head of rib, .-. .. .0'27-.037 



Diameters of face for tubercle of rib, .- _. ..._- .025 -.032 



Transverse diameter of pedicel, .. .044 



Antero-posterior diameter of pedicel, . -. .022 



Distance between faces for head of rib, .015 



Measurements of First Dorsal Vertebra. [Tinoeeras a nceps, 'Ho. 1030.) 



m. 



Length of floor of neural canal, _... .056 



Length of centrum, along under surf a.ce, .. .050 



Transverse diameter of anterior face of centrum, . _. .070 



Vertical diameter of anterior face of centrum (apjjroximate), _ _ .063 



Transverse diameter of posterior face of centrum, .080 



Vertical diameter of j)osterior face of centrum, -.. . 066 



'i'ransverse diameter of neural canal, . 068 



Vertical diameter of neural canal (approximate), .. 037 



Diameters of anterior capitular face, .031-035 



Diameters of posterior capitular face, ._ .033-040 



Antero-posterior diameter of pedicel, .030 



Transverse diameter of pedicel, . ._.. .029 



Diameter of vertebra, across transverse processes, .175 



11 



