284 



Annals of the Carnegie Museum. 



Transverse diameter of centrum behind 95 mm. 



Vertical diameter of neural canal 52 " 



Transverse diameter of neural canal 35 " 



Height of spine above neural canal 150 " 



Height of spine above postzygapophyses 105 " 



Height of spine above prezygapophyses 135 " 



Antero- posterior diameter of spine at base no " 



Antero-posterior diameter of spine at top 87 " 



Transverse diameter of spine at base posteriorly 30 " 



Transverse diameter of spine at base anteriorly 30 " 



Transverse diameter of spine at top 65 " 



Distance across postzygapophyses , 173 " 



Distance across prezygapophyses at their base. 230 " 



Last Lumbar Vertebra. 



(C. M. Cat. Vert. Foss., No. *§A.) 



The vertebra under consideration is not so well preserved as the one 

 described in the preceding paragraph, but the extremity of the left 



transverse process is sufficiently complete to show 

 W that it did not carry ribs. I assign it with doubt 



to the position of the last member of the lumbar 

 series on account of the manner in which the spine 

 fiWlES^ anc ^ postzygapophyses overhang backwardly. If 

 not that it must be one or the other of the two 

 *8llk vertebrae immediately preceding. In general ap- 

 pearance it is not unlike the seventh (?) vertebra 

 already described, except that the transverse proc- 

 esses are much narrower and the left, which is well 

 Fig. 4. Lateral preserved, shows no articular surfaces at the end. 

 view of the left side -p^g S pj ne \ ]as a mU ch smaller antero-posterior 



, ' ' r ' ; . , diameter at the top than the seventh dorsal and 

 vertebra of D. hatch- l 



eri. 1 nat. size. ^ ts posterior margin is placed more decidedly caudad 



than in that vertebra. Fig. 4 shows the left side 

 of the vertebra, which is the more complete, and which may be com- 

 pared with the corresponding view of the seventh dorsal. 



Dimensions. 



Extreme width from tip to tip of transverse processes'* 670 (?) mm. 



Height from bottom of centrum to tip of spinef 320 ± " 



*The right transverse process is broken ; the measurement given represents twice 

 the distance from the middle of the spine to the end of the left transverse process. 



f The top of the spine appears to be broken, and may not quite represent the true 

 length in life. 



