Annals of the Transvaal Museum 
93 
CONTRIBUTIONS TO THE KNOWLEDGE OF THE 
REPTILES OF THE KARROO FORMATION 
By Dr E. C. N. van Hoepen, M.I. 
6. FURTHER DINOSAURIAN MATERIAL IN THE TRANSVAAL MUSEUM. 
With 13 plates and 27 text-figures. 
Eucnemesaurus fortis n.g. et sp. 
The remains to be described under this name were collected by myself from 
a red mudstone, probably belonging to the Red Beds, on the farm Zonderhout, 
near the railway station of Slabberts. High above the locality is a krans of, 
probably, Cave Sandstone. The remains consist of the proximal half of a 
femur, a complete tibia, a proximal portion of a pubis, portions of dorsal and 
caudal vertebrae and some fragments. 
Dorsal Vertebrae. 
There are portions of three dorsal vertebrae. One centrum belonging to 
the region between the tenth and the fourteenth, a portion of a neural arch, 
which belongs to one of the vertebrae from the seventh backwards, and a 
neural arch which probably belongs to the sixth vertebra. 
The neural arch of the sixth vertebra is very much weathered. The anterior 
supporting ridge is narrow and in its turn supported by a smaller ridge, which 
starts near its upper end, runs downwards and nearly parallel to the posterior 
supporting ridge and disappears before reaching the centro-neural suture. 
There are deep cavities on both sides of this ridge. The sutural surface of the 
centro-neural suture shows a transverse groove in the middle. The breadth 
of the neural canal is 1*5 cm. posteriorly and 2 cm. anteriorly. Its height 
above the sutural surface is 2-5 cm. 
In the other neural arch there is probably only one supporting ridge for 
the processus transversus. It is too fragmentary to merit detailed description. 
The centrum (PI. XII, figs. 3 and 4) is large. Its length is about 10-5 cm. It 
has suffered from pressure, for one side is longer than the other and its lower 
surface shows signs of compression. The height of its anterior and posterior 
articulation surface is 1 1 - 5 cm. The breadth of the anterior surface is 12 cm. and 
of the posterior surface it may have been 13 cm., but this cannot be measured, 
because the right border of the posterior end is broken off. The posterior 
articulation surface is more concave than the anterior one. There is a deep 
longitudinal groove on both sides of the centrum and above its middle. There 
is a large knob on the upper anterior corner of the side of the centrum; this 
is a portion of the anterior supporting ridge of the processus transversus. The 
thickness of this knob suggests that this vertebra may be the thirteenth or the 
fourteenth. The articulation surfaces of the centro-neural suture are broad. 
A ridge runs transversely across their middle. The breadth of these surfaces 
in the middle is 3 cm. The neural canal is very deep in the middle of the 
vertebra. The bottom of the deepest part is divided in two by a ridge. The 
breadth of the neural canal in the middle is 1*3 cm. Its depth below the 
centro-neural sutural surface is 3 cm. 
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