v.] 



ED E NT A TA. 



57 



{pz^) which looks upwards and articulates with a corre- 

 sponding downward directed process {az^) developed on the 

 upper part of the arch of the following vertebra, rather 

 below the metapophysis (w). Thus the vertebra has a 

 process projecting backwards, with flattened articular facets 

 on its upper and under surface, fitting into a deep recess 

 on the anterior edge of the arch of the vertebra behind, 

 and the articulation is now by two zygapophysial surfaces 

 on each side of the arch instead of one. 



In the thirteenth thoracic vertebra a third articular facet 

 (/S-) is developed on the hinder margin of the lamina of 

 the arch, still higher than the last additional one (/s^), 

 and separated from it by a deep notch. This looks mainly 



Fig. 23. — Posterior surface of second 

 lumbar vertebra of Great Anteater, 5. 

 / transverse process; />z posterior zyg;t- 

 pophysis;/zi, ^z^. and /s3, additional 

 posterior articular facets. 



Fra. 24. — Anterior surface of third lum- 

 bar vertebra of Great Anteater, ^. 

 t Transverse process ; rn metapophysis ; 

 az anterior zygapophysis ; az^, az^, and 

 az^, additional anterior articular facets. 



outwards, and articulates with a corresponding facet {az-, 

 Fig. 24) on the anterior edge of the arch of the fourteenth 

 vertebra, placed to the inner side of the metapophysis, which 

 is now situated on a process projecting forwards into the 

 notch between the two upper articular facets of the ante- 



