36 
THE SAUROPOD DINOSAUR BAROSAURUS MARSH. 
Measurements of the Pubis 
Barosaurus 
lentus 
mm. 
Length 
( preserved 
| estimated 
665 
138S 
Length, iliac articulation 
Length, ischiatic articulation 290 
Width, proximal end (present) 390 
Width, shaft 177 
Width, distal end estimated ca. 400 
Average ratios : Barosaurus lentus and Diplodocus carnegiei 
Diplodocus 
carnegiei 
mm. 
820 
240 
180 
36S 
105 
240 
I.69 
I.6l 
(1.07)- 
I.69 
I.69 
I.67 
Figure 9. — Femur of Barosaurus and Diplodocus carnegiei, proximal ends superimposed. One-sixth 
natural size. Entire outline, Barosaurus, the summit of which is eroded away, dashes indicating the 
probable outline ; dotted line, Diplodocus, from a photograph by Hatcher 1901, Plate XI, Figure 3. A B, 
A' B', dimensions recorded in text, page 37. 
Ischium (see PI. VII). — What appears to be the proximal end of the left ischium 
is present. The acetabular surface is complete, slightly roughened, and thin-edged, 
very much as in Diplodocus. The Barosaurus ischium is larger, but a ratio between the 
bones is impossible to ascertain, except that the chordal distance across the acetabular 
surface is about 280 mm. to 250 mm. for D. carnegiei, a ratio of 1.12:1. 
If one may judge of the direction of the grain of the bone, the ischium of Baro- 
saurus does not seem to have had so slender a shaft as in Diplodocus, but this is highly 
conjectural. There is also a small portion of what seems to be the distal part of the 
ischium present, if the identity of the bone be correctly determined. It resembles that 
of Apatosaurus more than Diplodocus, in being more squarely truncated distally, and 
in having a rather prominent ridge on the outer face. 
