ShUFEI.DT : OSTKOLOGY OF THK HkKODIONF.S. 



vis. Indeed, so far as I have 

 been able to examine, it is this 

 vertebra throughout the Ar- 

 (icincc that holds this place. 

 (See Fig. 14 /vV. ) 



This twenty -fourth vertebra 

 possesses a pair of free ribs 

 which have already been de- 

 scribed above ; its neural spine 

 is continuous with the com- 

 mon median crest of the 

 others behind ; and its broad 

 diapophyses meet the under 

 side of the ilia, on either side, 

 to anchyloes with them. As 

 in the remainder of the pelvic 

 series of vertebrae, this bone 

 is highly pneumatic, the for- 

 amina entering the bones 

 much in the same manner as 

 we found them doing in the 

 dorsal region. 



The next four vertebrae be- 

 hind the twenty-fourth, or the 

 twenty-fifth, sixth, seventh and 

 eighth, throw up apophysial ab- 

 utments against the iliac walls, 

 to completely fuse with them. 



After we pass the twenty- 

 eighth we suddenly meet the 

 pelvic basin proper which is 



Fig. 14 bis. The ventral aspect of the 

 pelvis of Aritea her dias. By the author, and 

 natural size from the specimen. //, ilium ; 

 here deep and ample ; the ap- h, ischium ; P, post-pubic style ; ol>, obturator 

 Ophyses of the three next sue- foramen; ac, external aperture of acetabulum 



, (indicated by arrow entering it) . dl. 



ceeding vertebrae, or 



dorso- 

 lumbar vertebrae ; sc, sacral vertebra^ ; us, 

 twenty-ninth, thirtieth, and uro sacral vertebra- (probably six of them), 

 thirty-first are thrown so di- 

 rectly upwards against the pelvic bones, that they can not be 

 seen on direct ventral aspect. This is the region of the greatest 

 enlargement of the neural canal, and also the bones through which 



