I'JU 



/'///: BONES, 



manner by the naturalists who attempted it. Some admitted a single 

 cephalic vertebra ; others admitted three or four; while others again arrived 

 at six or seven. 



These difficulties and contradictory results may be understood, when it is 



borne in mind what profound modifications the vertebra) must li;i\ 

 perienced to constitute the bones of the head. 



At present the problem appears solved. The head is composed of four 

 vertebne, in which are found the various parts enumerated in the description 

 of the typical vertebra. 



