Mucous groove 



Inner eye of right twin head 



Supraorbital bar 



Rectus oc. ext. 



Cavity of cerebral lobes 



Olfactory cartilage 



Olfactory nerve and pit 

 Rectus oc. inlernus 

 Obliq. inf. of oute' 



Palato-pterygoid 

 Rectus oc. inf. 



Trabeculae cranii 



Inward dip of surface epithelium 

 Commencement of an inner or adjacent lower lip 

 Anterior ends of united inner Meckel's bars 



Commencement of optic lobes 



Supraorbital bars 



Pineal body 



■ Rectus oc. ext. 



Rectus oc. sup. 



Cerebral lobes 



Olfactory cartilage 



Rectus oc. int. 



' "J Q- - .\/\ Olfactory organ 



^""-'-ix. ") Obliq. oc. inf. of outer eye 



*-» ~* Trabeculae cranii 



"" Palato-pterygoid cartil I 



An inner lower lip 



: ^ Anterior end of united inner hyomandibulars 

 i Upper end of united inner Meckel's cartilages 

 Inward dip of surface epithelium 



J. F. G. 



XIII 



