536 



F. H. EDGEWORTH. 



divided into an internal pterygoid muscle arising from the 

 palato-pterygoid bar (text-fig. 28, p. 531), and an external 



cer.hya/c 



Text-figs. 32 and 33. — Sagittal section.s through an emhryo of 

 Chaniajleon. 32 is the more external. (For exphination of lettering 

 see p. 555.) 



