Semicircular canals of inner 



compressed double otocyst 

 Optic lobes 



Periotic cartilage 



Supraorbital bar 

 Infundibulum 

 "■■-Rectus oc. sup. 



nner recti near their origins 



Rect. int. outer eye 

 Rect. inf. outer eye 

 Palato-pterygoid 



Trabeculae cranii 

 Periotic cartilage (composite) 

 United adjacent hyomandibulars 

 United adjacent hyoids 

 The two adjacent Meckel's cartilages in the septum between 

 the two mouth openings 



Semicircular canals of inner compressed double octocyst 



Optic lobes 



......The two utricles, here separate 



Iter 



_ -.-Supraorbital bar 

 .... Rectus oc. sup. 

 .V.. Cavity of hypoarium 



Floor of periotic capsule 

 Trabeculae cranii 

 Rect. inf. outer eye 

 Palato-pterygoid 

 United adjacent hyoids 

 An outer Meckel's cartilage 

 The two adjacent Meckel's cartilages in the septum between 

 the two mouth openings. 



Mesial muscular mass 



Medulla (almost double) 



Parts of inner composite labyrinth 

 • ; United inner jugular veins 



Periotic capsule 

 ..."..- Parts of an outer labyrinth 



... Ganglion, auditory nerve 

 ... Parachordal cartilages 



Notochord 



Hyomandibular 



Upper end, visceral arch III 



(ist branchial) 

 Aortic arch and roots 



Visceral arch IV 



Visceral arch V 



Copula arch V 



""'-- Hyoid cartilage (an outer arch) 



Truncus arteriosus 

 Irregular septum between the two mouth openings 



J. F. G. 



XIV 



