161 



The anterior section is aero** the driitary piece at the extremity of the iplenial. The 

 ecood WBtioa it acroe* both deutary and tpletiial, at the extremity of the angular pirrr. TVe 

 third section create* the deotary, the cplcnial, the angular, aud the anterior extretnity of the 

 mngikr piece, and shows the wide canty Mrrouuded by the*e piece* : each piece bran 

 iu characteristic uumbrr, according to the Table of SYNONYM*. 



Pretftted by Prof. Otcfn, F.Jt.S. 



731. The centrum and neurapophyscs of the atlas of a Crocodile. The neural spin 



e 



The centnun i* wedge-shaped, with the bate downward* and the anterior nurfarc excavated 

 to form the lower half of the cup for the eondyle of the occiput : the posterior surface is 

 early flat, with the lateral margin* expanded and bent forward* to give attachment to the 

 pleun|Mi|>hyr* : each neurapophyn* prevent* an articular surface at the fore part of it* bate 

 for the occipital eondyle, and at the back part for the odontoid rpiphyn* of the axis : the 

 odontoid procea* project* into the *pace between the*e part* of the neurapophy*e* and the 

 centrum. Abore theae part* the neurapophyte* cirrum*cribe the neural canal ; they meet 

 and articulate with each other, but do not coalesce above. Each derelope* a email zygapo- 

 pbyai* poatcriorly, the articular surface of which look* downward*. 



732. A second cervical vertebra of a Crocodile, with the central part of the body of 

 the atlas, forming the ' odontoid process ' of anthropotomy, attached by sy n- 

 rhondrosis to the fore part of the body. 



The upper part of the odontoid presents a broad nibcircular neural surface between two 

 neurapophytial surface*, each of which form* two oppositely doping facet* ; the anterior 

 one for the neurapophysi* of the atlas, the posterior one for that of the axis : thew surfaces 

 are divided by a notch from a lower diapophysial protuberance of the odontoid, which nip- 

 port* the pleurapophyn* of the second vertebra. The proper body of the second vertebra 

 ha* an inferior tubercle. The neural arch ha* two small anterior zygapophyse*, looking up- 

 ward* and outward* ; two larger posterior one*, with an opposite aspect ; and a compreseed 

 confluent neural spine. 



Huntfrian. 



733. The third cervical vertebra of the same Crocodile. Hmltria*. 



734. The sixth cervical vertebra of a Crocodile. 



The centrum present* an anterior concavity and a posterior convexity, a* in most of the 

 other Tertebrse : it ha* two oblong parapophyse* laterally, and a abort and strong hypapo- 

 phrsis developed from the anterior half of it* under part. The neurapophy*e* are perma- 

 nently articulated by sutural surface* to the centrum, but coalesce above with each other and 



T 



