Annals of the Transvaal Museum 
139 
Vertebra. 
The vertebra is the first dorsal (PI. XXIII) . The length of its centrum near 
the neural suture is 7-2 cm. The distance between the lower ends of the articu- 
lation surfaces is 7*7 cm. The height of the anterior articulation surface 6-7 cm. 
and its breadth is about 5 cm. The height of the posterior articulation surface 
is 6-2 cm. and its breadth 5-4 cm. The centrum possesses a tremendously 
narrow keel, the lower border of which is nearly straight. The articulation 
surface for the capitulum costae lies slightly in front of the middle of the 
centrum and borders on the centro-neural suture. It also lies nearly straight 
below the large concavity under the processus transversus. It is a deeply 
concave surface, which is bordered by a high wall, and which is open behind. 
Its hinder margin, however, lies higher than the nearest surface of the centrum 
and is therefore a ridge. This ridge continues upwards and through its sig- 
moidal shape its upper end lies straight above the middle of the parapophysis. 
Here it is prominent, but its height diminishes as it continues until it dis- 
appears well between the two downward ridges from the processus transversus 
and nearer to the anterior than to the posterior one. There is a small knob 
immediately below the parapophysis. Both transverse processes have been 
broken off, the left one near its origin, and the right one in such a way that 
the hinder border of its distal end is still preserved. The processus is directed 
slightly backwards and what is left of its upper surface slopes outwards and 
slightly upwards. The processus is supported below by two ridges, which 
diverge downwards under an acute angle. The outer edge of the posterior 
ridge is thicker and stands further outwards than that of the anterior ridge. 
The distal end of the processus may have been triangular and is much thicker 
than its proximal end. The lower angle of this triangle is prolonged into a 
small, downwardly directed knob. The spaces between the processus trans- 
versus and the zygapophyses are roofed in by a thin sheet of bone. The space 
between the supporting ridges of the processus and these bony roofs is occupied 
by deep pits, the hinder one of which is deeper than the anterior one. The 
whole upper surface of these bony roofs and of the processus transversus, 
which is flat as far as preserved, slopes forwards and downwards. There are 
also supporting ridges below the zygapophyses. All the supporting ridges of 
one side form together the letter W. The praezygapophyses are broken off. 
The postzygapophyses project beyond the articulation surface of the centrum. 
Their articulation surfaces converge downwards under an acute angle. There 
is a deep groove between the postzygapophyses which runs forwards and cuts 
into the hinder edge of the processus spinosus. The processus spinosus is very 
narrow and thick; its upper end is damaged. Both articulation surfaces of 
the centrum are concave, however, the hinder one more so than the anterior 
one. The neural canal has an anterior height of 2-1 cm. and breadth of 2-6 cm. 
and a posterior height of 2-4 cm. and breadth of 1-9 cm. In the middle its 
height is about 4*5 cm. and its breadth about 1-9 cm. 
Foot. 
There is a proximal end of metatarsale III. The proximal surface is 
slightly concave. The anterior border is broken off. The medial border is 
fairly straight and slightly convex in its hinder portion. Length of medial 
border 5-2 cm., of anterior border 3-2 cm. and of lateral border probably 
about 4-5 cm. Length of whole piece 5 cm. 
The first phalanx of the first left toe. The bone has apparently not suffered 
from pressure. Length 5-8 cm., proximal breadth 3-5 cm., proximal thickness 
