
538 RECORDS OF THE S.A. Museum 
shape while the distal facet is narrowly oval an, because of the aforementioned 
twist, its long axis is almost at right angles to that of the proximal end, 
The seven cervical vertebrae (pl. xviii, fig. 1-3) are aukylosed into a single 
unit, the height of which (106 mn.) is approximately three-fourths the greatest 
width (atlas, 42mm.) There isa lateral foramen on each side between atlas and 
axis; posterior and a little below each of these is a larger single foramen, the 
opening extending apparently between the axis and seventh cervical, Seen from 
the side the eombiued neural avehes present an unbroken dorsal outline, rising 
steeply and abruptly elevated at the rear to form a short vonnded spine, 
There are thirteen (horacie vertebrae. The first (pl. xviii, fie. +) is free from 
the cervicals, but tts anterior parts are quite closely applied to the posterior face 
of the neck vertebrae, The neural arch of the first thoracic is not complete, there 
being a dorsal gap of about  mm.; it is triangular rather than snboval, as it is in 
the other examples now examined (see pl. xviii, fig. 4) and the nenital eanal is 
only one-fourth as wide againas deep. In contormity with the asvinmetry of the 
posterior ribs, as mentioned below, ou the twelfth thoracic the tubereular facet 
on the right transverse process is 20 min, in length and that of the left 80 mim. 
the last thoracic has a small articular face on the thickened outer edge of the left 
transverse process but there is no such facet ou the right side, 
As in five of the other specimens which have been recorded (Allen 1941, p. 32) 
there ave nine lumbar vertebrae, 
The candals number twenty-six, making a total of fifty-five vertebrae, only one 
less than counted by Allen for the adult female from Virginia (Allen, loc. cit.). 
The metapophyses disappear alter the fourth eandal, while the neural canal 
becomes an open groove on the simimit of the thirteenth and disappears after the 
eighteenth caudal, There are fourteen pairs of chevrons, the menibers of all but 
one pair being united, 
There are thirteen vibs on the left side but only twelve on the right; the anterior 
seven pairs have both tuberele and head, Td will be noted from the table of 
measurements that ihe twelfth paiv are markedly asymmetrical aid that the right 
member of this pair, like the thirteenth rib of the left side, is abruptly shorter than 
the preceding rib. These last ribs are considerably shorter than the corresponding 
ones in the calf, but.are mueh stouter. 
The sterniou (text fix, 15) consists of the usual three sectinus. The manubrium 
has broad, wing-ike lateral expansions in the anterior half, where it is a little 
wider than its eveatest lenyth ; in the posterior half the lateral margins are concave 
and converge towards the truncate hinder face which, like the anterior margin, is 
shallowly incised medianly. The second segment is less than two-thirds as long as 
the manubrium, is two-thirds as long again as wide, has concave lateral margins, 
