Vol. IX] 



VON GELDERN— FLORIDA CHAMELEON 



319 



In order that the muscular forces necessary to erect the pro- 

 cessus retrobasaHs be understood, it is necessary to take up the 

 individual muscles of the hyoid apparatus. 



IV 



These muscles are arranged in three layers. First, there 

 is a thin, superficial layer not directly connected with the 

 hyoid. Secondly, there are the supra- and infra-hyoid muscles, 

 and thirdly, the muscles of the tongue. (Figs. 3, 4.) 



'Tn^nc/i'S/e 



M. 





processus entoc/ossus 

 \ hyoglossus 



^^tit horn 

 _oosthorn 



proceSJo^ 

 'retro b^salis 



.^'P^cfbr^lis 



Third Lauer o f HqcIcI Muscles 



Fig. 4 



