MORPHOLOGY OF BAROSAURUS LENTUS. 2 9 
Measurements of Caudal XX 
Barosaurus 
lentus 
mm. 
Height over all 3io 
Centrum, posterior face, height I4 2 
" width 183 
" mid length, width 116 
There are portions of centra which represent at least five more caudal vertebra, 
one of which was anterior to the fourteenth and four posterior to the twentieth. In 
addition, there are two small distal bones, one of which is nearly perfect. 
Caudal ca. XXXII (PI. VI, Fig. 4).— The centrum of this bone is complete, as is 
the neural arch; the zygapophyses alone are lacking. The centrum is rather slender, 
with widely expanded ends, the posterior one of which is convex and oblique and 
possibly abnormal. The anterior face is somewhat concave. There is no trace of the 
inferior depression in the centrum nor of spinous process, although the latter may 
have been present above the missing postzygapophyses. 
Measurements of Caudal ca. XXXII 
Barosaurus 
lentils 
mm. 
Length over all 97 
Height over all S 2 -S 
Centrum, anterior face, height 37-8 
" width 47 
" posterior face, height 42.5 
" width 37-5 
Caudal ? ■ — A portion of the centrum of a distal caudal is preserved. It 
resembles those of the slender "whiplash" terminus of the tail of Diplodocus, as there 
is no trace whatever of the neural arch. The fragment seems to pertain to the posterior 
half of the original bone, as the articular face is convex. 
Measurements of Caudal ? 
Barosaurus 
lentus 
mm. 
Length as preserved 5-5 
Articular face, height 21.7 
" width 22.7 
Centrum, height 17-3 
" width 11.6 
CHEVRON BONES 
Of the bones which constitute the hsemal arch of the tail, the chevrons, three 
characteristic ones are present, illustrating two distinct types. 
Chevron ca. V (PL VI, Fig. 5; Text Fig. 3). — One of these chevrons is from 
the anterior part of the tail. In size it compares with the fifth in the American Museum 
specimen of Diplodocus longus," and agrees therewith in curvature, although somewhat 
more tapering. The base is broad, complete, and the two sides are connected by a 
11 Osborn, op. cit., Fig. 12. 
