The Skeleton 55 
described as a type of this region (Fig. 18, A). Its 
centrum is rather longer than in the first two 
thoracic and in the cervical vertebree and has no 
process for articulation with the head of the rib, 
otherwise it is essentially the same. Like all of 
Fic. 18. ANTERIOR View oF A, A LATE THORACIC AND B, THE 
First SAcRAL VERTEBRA OF A YOUNG CROCODILE 
(C. palustris). X4. (After Reynolds.) 
. neural spine. 4. sacral rib. 
2. process bearing prezygapophysis. 5. surface which is united with 
. facet for articulation with the the ilium. 
capitulum of the rib. 6. concave anterior face of centrum. 
the vertebre behind it and unlike those in front 
it is apparently completely fused with its neural 
arch. The neural arch is very broad (in an antero- 
posterior direction) and is extended dorsally as a 
wide neural spine (1). The neural spines of the 
following thoracic and the first two or three lumbar 
vertebre are increasingly broad and truncated. 
The transverse processes are very broad, long and 
thin, and in the third to eighth vertebre they have 
