1869. | HUXLEY—TRIASSIC DINOSAURIA. 41 
so-called “ scapula ” (tab. x. fig. 7) looks to me very much like the 
ischium ; but the figure is not of such a character as to allow me to 
speak with confidence on this point. Putting the information yielded 
by these two skeletons together, it proves the existence in the Upper 
Trias of Stuttgart of a Dinosaurian of great size. 
The sixty vertebree which le in uninterrupted series in the speci- 
men A, occupy a length of seventeen Wiirttemberg feet. Thirty- 
seven of these vertebree form a tail eight feet long. Two (more 
probably three) vertebra in the sacrum take up a foot, while the 
twenty-one presacral vertebra form a series 7 feet long. The cen- 
trum of the last caudal vertebra is 1°5 in. long, and rather less than 
1 in. in vertical height of the articular surface ; and the tail is not 
complete. The middle caudal vertebre have centra 2°5 in. long, with 
a height of 1:25 in. Further towards the sacrum the centra are 4 
inches high and 3 inches long. ‘The hindermost of the presacral ver- 
tebre have the articular surface of the centra 6 inches wide, and are 
from 5 to 6 in. long. They diminish in size forwards; and the five 
most anterior, which together occupy 2 feet, have about the dimen- 
sions of the middle caudal vertebrae. The centra are all constricted 
in the middle of their length, and have slightly coneave articular 
surfaces. The articular faces of the centra are almost circular in 
contour. The spinous process is flat, quadrangular, 3-4 in. high, 
4-5in. long. It follows from this account that the two cervical ver- 
tebree of the specimen B, which are opisthoccelous, must have had 
their place in front of the twenty-one presacral vertebree shown to 
exist by A; and as neither of these 1s axis or atlas, there must have 
been, at fewest, twenty-five presacral vertebrae, which is one more 
than exists in a crocodile. But as the tubercular transverse processes 
of the cervical vertebre in question arise low down in their arches, 
and the capitular processes lie below the middle of the centrum, they 
may well be anterior cervicals. The characters of the dorsal verte- 
bree, as shown by the two consecutive series of five and eight re- 
spectively in B, are very singular, and in some respects anomalous. 
The sacrum is unlike that of other Dinosauria, in possessing only 
two completely ankylosed vertebree. On the other hand, the expan- 
sion and coalescence of the sacral ribs at their extremities is charac- 
teristically Dinosaurian. No chevron bones are described or figured. 
One of the most remarkable portions of the skeleton A is an oblong 
plate of bone, nearly two feet long, and having apparently half that 
width, with edges which vary from one to three inches in thickness. 
The anterior external angles are prolonged into stout processes, 
which are directed upwards and inwards and are somewhat re- 
curved. Professor Plieninger considers this bone to be the sternum ; 
and I see no reason for dissenting from his interpretation. A Rhea 
of the same size as the triassic Dinosaurian would present a sternum 
of very similar proportions, especially as regards the antero-lateral 
or plewrosteal processes. 
The scapula of B has a length of 21 inches. It is long and nar- 
row. The coracoid is short and rounded, as in other Dinosauria. 
The humerus of A is rather more than 17 inches long ; but that of B 
