PLATE VII. 



Fig. 1 . The five sacral vertebrae, upper view. 

 Fig. 2. The sacral vertebrae, back view. 



One-fourth natural size ; c, centrum ; ni,»i, coalesced neurapophyses ; ns i, 



ns 4, coalesced neural spines, of the four anterior vertebrae ; ns s, neural 



spine of fifth vertebra ; d i, », a, <, s, diapophyses ; m a-m s, metapophyses ; 



o \-o !, posterior outlets of nerve-canals ; z, anterior, z', posterior, zygapo- 



physes. 



e 2 



