14 THE SAUROPOD DINOSAUR BAROSAURUS MARSH. 
Cervical XIV {Vertebra T). — This bone is only partly preserved, the fragment 
consisting of the posterior part of the centrum, bearing the left postzygapophysis and a 
portion of the right. In this bone the lateral pleuroccele is further reduced and is 
shallow compared with that of cervical XIII. However, it is not entirely preserved. 
Its posterior limitation is 340 mm. forward of the hinder margin of the centrum. The 
lateral extent of the postzygapophysial facet is 195 mm. Ventrally the centrum is limited 
posteriorly by two rather deep longitudinal keels, as in D. camegiei. 
The circumference of the posterior face of the centrum is 870 mm., its horizontal 
diameter 300 mm., and the vertical one about 220 mm. The face is somewhat distorted, 
but does not exhibit the crushing shown in the other cervicals, hence these measurements 
have greater value. 
Cervical XV (Vertebra R) (PL II, Figs. 3, 4).' — This is a very well preserved 
bone, which, however, has suffered a dorso-ventral crushing so that, as in cervical XIII, 
not only are the ends of the centra apparently too broad for their height, but they appear 
obliquely sheared, the dorsal margin of the posterior face being at least 100 mm. in 
advance of the ventral. To what extent the obliquity of the articular faces in these 
cervicals is actually due to crushing is difficult to conjecture, for in D. camegiei it is 
very slight, although greatest in cervicals XIV and XV, especially the latter. It may 
well be that in Barosaurus this obliquity was more marked, and correlated with a greater 
vertical range of movement of the neck (see below, page 15 and PI. VII, description). 
The postzygapophyses and the bifid neural spine are missing to the base of the cleft. 
The prezygapophyses are borne on very broadly expanded wing-like laminae which 
also bear laterally the tubercular facets for the ribs. These laminae are very thin, except 
forward where they thicken to bear the weight of the zygapophyses. Elsewhere the 
laminae are supported by ' radial bracket-like buttresses, especially deep ones running 
from the centrum to the rib facet or diapophysis (see PI. II, Fig. 4). The latter is 
again not so massive as in Diplodocus camegiei, but has the same relative position, about 
mid-length the entire vertebra as it is now preserved. 
The relative position of the two rib facets differs in this vertebra from that in any 
other Barosaurus cervicals which are present, as well as from that in the fifteenth 
cervical of Diplodocus camegiei, in that the capitular facet lies behind the tubercular 
at least 50 mm. ; in all the other cervicals mentioned the capitular lies in front. To 
what extent, if any, this is due to an oblique shearing is not apparent; it seems, 
however, to be significant and in harmony with the great obliquity of the articular 
faces of the centrum. 
The pleurocceles are neither so deep nor so conspicuous as in the twelfth centrum, 
where they reach their greatest depth among the preserved cervicals. The posterior 
limit of the left pleuroccele is about 300 mm. forward of the margin of the posterior 
face of the centrum. 
Oblique laminae running in the wake of the anterior zygapophyses are very widely 
developed. These serve posteriorly to buttress the expanded articular face. From this, 
thin horizontal laminae run out along the posterior face of the diapophysis and thus form 
the hinder margin of the expanded, wing-like plates. 
