MORPHOLOGY OF BAROSAURUS. LENTUS. 25 
Measurements of Caudal IV 
Barosaurus Diplodocus 
lentus carnegiei Ratios 
mm. mm. 
Length over all 275* 
Height over all 650 865* 0.75 
Width across diapophyses 585* 
Centrum, length 208 215* 0.97 
" anterior face, height 245 298* 0.82 
" " " width 370 335* 1. 10 
" " circumference 1012 
posterior face, height 220 272* 0.81 
" width 333 328* 1.01 
Pleuroccele, length 99 
height 68 
Neural canal, height at anterior face 46-50 
" width " " 45-50 
Width across prezygapophyses ca. 230 
Width across postzygapophyses 225 
Neural spine, width of summit 108 
Postspinal lamina rugosity, vertical length 345 
Average ratios : Barosaurus lentus and Diplodocus carnegiei 0.91 
* Peterson's measurements. 
Caudal V (Vertebra D). — The centrum and right diapophysis are preserved intact. 
The remainder, above the neural canal, is missing, except that a portion of the discon- 
nected spine is preserved. 
Anterior aspect. — Vertical height of diapophysial lamina, 230 mm. Height of 
spine above the prezygapophyses, estimated at 320 mm. 
Measurements of Caudal V 
Barosaurus Diplodocus 
lentus carnegiei Ratios 
mm. mm. 
Length over all 265* 
Height over all 835* 
Width across diapophyses 595t 544* 1.09 
Centrum, length 219 200* 1.09 
anterior face, height 253 290* 0.87 
" width 355 335* 1.06 
posterior face, height 216 263* 0.82 
" width 318 320* 0.99 
Neural canal, height 46 
" width 40 
Average ratios : Barosaurus lentus and Diplodocus carnegiei 0.99 
* Peterson's measurements, 
t Estimated. 
Caudal VI. — This bone seems to be represented by vertebrae F and C. Of the 
former only a portion of the centrum with the neural arch and spine is present, and of 
the latter a supplementary part of the centrum. They show no remarkable characteris- 
tics which would tend to differentiate them from caudal V. Another fragment of a 
centrum is also present which was evidently adjacent to the others in the living animal. 
Caudal XIII. — From caudal VI to the estimated thirteenth none are preserved entire, 
although certain fragments of centra may pertain to intervening bones. The thirteenth, 
