94 
Annals of the Transvaal Museum 
Caudal Vertebrae. 
Remains of four caudal vertebrae are present (PI. XIII, fig. i). One of these 
is apparently the greater part of the fourth caudal. Its distal articulation 
surface is broken off. The concave anterior articulation surface has a height ! 
of 9 cm. and a breadth of 8-5 cm. Its lower border is much thicker and broader 
than the sides; this is for articulation of the haemapophysis. The centrum is 
thickest immediately below the transverse processes, where it measures 5 cm. 
The sides converge downwards, and as far as can be made out, the lower 
surface is rounded. If the anterior articulation surface is placed vertically, 
the upper surfaces of the broken off transverse processes slope backwards and 
downwards. The praezygapophyses are broken off. The anterior edge of the 
processus spinosus starts somewhat in front of the middle of the bone and 
slopes upwards and backwards. This front edge is concave. The section of 
the base of the process is wedge-shaped. The base of the transverse process 
is very broad. It starts at about 3 cm. from the anterior edge of the centrum. 
Its thickness on the left side is i*8 cm. 
Two others are from the middle caudal region and perhaps from the 
twelfth to the sixteenth. The posterior one of the two has lost its anterior half 
and its dorsal spine. Its concave posterior articulation surface has a height of 
6 cm. and a breadth of 5 -5 cm. The hinder border of the left transverse process 
lies 2 cm. in front of the hinder border of the centrum. The anterior one of 
the two has lost a piece of its anterior articulation surface. The length of its 
centrum is 7-8 cm. above and 6*2 cm. below. The anterior articulation surface 
is more concave than the posterior one, but this may be due to the developing, 
because there was scarcely any difference between the bone and its incrusta- 
tion. The transverse process is attached about 0-5 cm. in front of the posterior 
border of the Centrum. The height of the anterior articulation surface is 6 cm. 
The height of the posterior surface is slightly less and its breadth 5-3 cm. 
The fourth vertebra belongs to the end of the middle caudal region. It is 
too much weathered to give any detail. The length of the centrum was at 
least 6 cm. and its height at least 3-5 cm. There is a transverse process which 
has a proximal breadth of 2 cm. The processus spinosus stands on the distal 
half of the bone. 
Pubis. 
Two pieces of the left pubis are preserved, the distal and the proximal end. 
The proximal end (PL XI, figs. 3 and 4, and text-fig. 1) consists of the neck 
with the processus subacetabularis. The distal end of the piece still belongs 
to the pubic plate. The inner side of this end is bent down. The section at 
the distal fracture is a flat oval, the inner end of which is elongated and ulti- 
mately broken off. The neck gives the impression of being peculiarly short. 
Its section differs greatly from that of the pubic neck of Dromicosaurus gracilis 
described hereafter. Through lack of material and literature it could not be 
made out whether this difference is of family value. There is no demarcation 
between an anterior and a medial surface of the neck. A section shows a 
regularly convex line from the medial border of the neck over the medial and 
anterior surfaces to its lateral border. The neck has a distinct lateral surface, 
which broadens rapidly into the lateral surface of the proximal end, and which 
narrows down rapidly into the lateral border of the plate. This lateral surface 
of the neck rounds off broadly into the hinder surface, which is concave in 
all directions. The greatest breadth of the neck, from the inner to the lateral 
border, is 6 cm., while its greatest thickness, measured at the upper fracture 
(see PI. XI), is 3 cm. The inner portion of the neck is thin and bent backwards. 
