DESCRIPTION OF A NEW SPECIMEN OF GLYPTODON Sor 
The broad wing-like plates which represent the coalesced trans- 
verse processes of the first, second, and third vertebre of the thirteen, 
exhibit distinct articular surfaces for the capitula and tubercula of 
ribs. Further back, the natural edges of the apophysial ridges 
are broken away, up to the eighth vertebra. Here they are entire on 
the left side and broken on the right; but, curiously enough, the 
broken processes are higher than the entire ones, so that the transverse 
processes in this region of the body must have been asymmetrically 
developed. The thirteenth vertebra presents peculiarities which 
could only be made intelligible by a lengthened description, and by 
figures. The contours of the articular processes become first dis- 
tinctly traceable at the posterior part of the eleventh vertebra. They 
are better marked at the posterior part of the twelfth, and at the 
anterior part of the thirteenth vertebra. 
The nervous foramina are not intervertebral, but pierce the arches 
of the vertebre throughout the series. In the thirteenth the outlet 
of the foramen is separated, by a longitudinal bar of bone, into an 
upper and a lower division. 
The posterior part of the thirteenth vertebra is much injured, and 
does not adjust itself naturally to the anterior end of that part of the 
lumbar region of the vertebral column (consisting of two vertebre) 
which remains continuously anchylosed with the sacrum. One or 
two vertebrae may possibly be wanting, or even three ; but I conceive 
the last to be the extreme limit of the deficiency’. 
The great Priodont Armadillo has twenty dorsal lumbar vertebra. 
If the Glyptodon had the same number, there would be three missing ; 
for there are two dorsal vertebree in the trivertebral plate, thirteen 
follow it, and two lumbar are anchylosed with the sacral, making 
altogether seventeen. 
The ‘sacrum,’ composed of anchylosed lumbar, proper sacral, and 
coccygeal vertebra, contains at fewest twelve, and perhaps thirteen 
vertebra. The centra of the two lumbar vertebre and of the two 
proper sacral vertebrae which follow them are preserved. They are 
thin and broad plates, flat above, and slightly concave below, exhibit- 
ing a most marked contrast with the half-cylinder of the hindermost 
of the thirteen dorsal vertebrae above described. It would seem to 
require the interposition of at least two, if not three, vertebre to 
effect the transition of the one form of centrum into the other. 
The last coccygeal is the only vertebra among all those preserved 
the centrum of which exhibits characters at all like those of an 
1 Unless I greatly err in my interpretation of the photographs, these three missing 
vertebrae are preserved in the Turin Glyptodon. 
