GEOLOGICAL SOCIETY. 



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angustidens, or perhaps the narrowness of this tooth 

 may be occasioned by the old age of the animal ? be- 

 cause not only the external thick enamel of the trans- 

 verse eminences of this maxillary tooth, has entirely dis- 

 appeared, but the whole of the eminences are worn 

 down, so that the crown is nearly flat, and shows only 

 four large irregular three-lobed transverse sections, 

 formed by the bases of the before mentioned eminences. 



It is unnecessary to give a more detailed description 

 of these bones ; they are already sufficiently known ; 

 but I must mentioned one singular peculiarity — that is, 

 an anchylosis of the dental vertebra with the third or 

 next cervical vertebra; the cartilage between them is 

 entirely ossified, even the marks of the junction have 

 disappeared at several places ; only in the front are two 

 places of about two inches where they are not in close 

 contact ; the animal must have had also a crooked neck, 

 because the right side of the cervical vertebra, while 

 the superfices is perfect, is less in height than the left 

 side, in the proportions of one inch and two-fifths to two 

 inches and one-tenth ; also the right lateral foramen of 

 the atlas is completely filled and ossified, leaving no 

 marks of its existence. 



These bones were about half a mile from Liberty 

 meeting house, north-east corner of Williamson county, 

 about eleven miles south-east of Nashville. They were 

 imbedded in a rich black mould, resting on a stiff ferru- 

 ginous loam, which the bones partly penetrated. I 

 found in the black part some pieces of ferruginous sand- 

 stone, or rather grains of sand agglutinated by hydrated 



