MORPHOLOGY OF BAROSAURUS LENTUS. 
2 I 
Measurements of Dorsal IX 
Barosaurus 
lentus 
mm. 
Length over all 255 
Height over all 850 
Width across diapophyses 
Centrum, length ±2i2f 
" anterior face, height 260 
" " *' width 240+ 
" posterior face, height . . . : 280 
" width 30S 
" " " circumference 980 
Neural canal, height 35 
" . " width 55 
Width across pedicels 160 
Width across prezygapophyses 445 
Height to prezygapophyses 480 
Width across postzygapophyses 225 
Average ratios: Barosaurus lentus and Diplodocus carnegiei 
* Peterson's measurements, 
f From photograph. 
Diplodocus 
carnegiei 
mm. 
Ratios, 
355* 
0.72 
1028* 
O.83 
475* 
245* 
0.87 
275* 
0.94 
295* 
0.8l 
295* 
0-95 
310* 
O.98 
980* 
1. 00 
0.89 
Dorsal X ( Vertebra I) . — This bone has a well preserved centrum ; the posterior 
portion above the centrum, however, is missing from a point a little above the neural 
canal, including the postzygapophyses and the entire spine. The prezygapophyses and 
a small portion of the left diapophysis remain. 
Right lateral aspect. — There is a well developed pleuroccele within the limits of 
the centrum. It is divided by a partition into a deeper forward and a lesser and more 
shallow hinder portion. 
Anterior aspect. — This shows the outline of the centrum not quite complete. 
Posterior aspect. — The face of the centrum is but slightly concave. 
Measurements of Dorsal X 
Barosaurus 
lentus 
mm. 
Length over all 
Height over all 
Width across diapophyses 
Centrum, length 
anterior face, height 265 
" " " width 260 
" posterior face, height 280 
" width ... 290 
Pleuroccele, length 95 
height 80 
Neural canal, height 52 
" width 58 
Width across pedicels '. 230 
Width across prezygapophyses 240 
Distance between prezygapophyses 30 
Average ratios : Barosaurus lentus and Diplodocus carnegiei 
* Peterson's measurements. 
Diplodocus 
carnegie 
Ratio: 
mm. 
365* 
1070* 
495* 
290* 
ca. 305* 
O.87 
ca. 33s* 
O.78 
312* 
0.90 
325* 
0.89 
o.a 
