334 



MANUAL OF ZOOLOGY 



SECT. 



cent 

 C E 



specially modified in connection with the movements of 

 the head on the trunk. The vertebrae of the thoracic region 



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r\ ^v^^F^ 



r*-4^ 



cent r-j 

 neu-r* 



-pt-sy 



cent 



FIG. 196. Vertebrae of Lizard. A, anterior, B, posterior, view of a thoracic 

 vertebra ; C, lateral, D, anterior, view of atlas vertebra ; A', lateral view of 

 axis, cent, centrum ; hyp. hypapophysis of axis ; lat. lateral piece of atlas ; lig. 

 ligmentous band dividing the ring of the atlas into two ; neur. neural ai*ch of 

 atlas ; od. odontoid pr.ocess ; pr- zy pre-zygapophysis, or anterior articulating 

 process ; pt. zy. post-zygapophysis, or posterior articulating process ; rb. rib ; sp. 

 spine ; vent, ventral piece of atlas. 



are characterised by the possession of ribs, which, in the case of 

 the most anterior are connected with the breast-bone or 

 sternum by slender cartilaginous sternal ribs. In the lumbar 



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art 



pr.zy 



cent 



FIG. roy. Lepus cuniculus. A, atlas and axis, ventral aspect; od. odontoid pro- 

 cess of axis. B, lateral view of axis ; art. articular facet for occipital condyle ; 

 od. odontoid process ; pt. zy. post-zygapophysis ; sp. neural spine. C, thoracic 

 vertebrae, lateral view. cent, centrum ; fac. facet for rib ; met. metapophysis ; 

 pr. zy. pre-zygapophysis ; pt. zy. post -zygapophy sis ; rb. rib ; sp. spine. 



region there are no ribs. The sacral region is distinguished 

 by its relations with the hind limb. The caudal region, short 



