The inner eyes 

 Recti superiores of above 

 Tegminal cartilage 

 Cavity of cerebral lobes 

 Supraorbital cartilage 



Optic lobes 

 Ventricle III 

 Oblic|uus superior 

 Rectus oculi superior 

 Outer eye of right embryo 

 Cavity of optic lobes 

 Optic lobes 

 Periotic cartilage 



- Semicircular canal 

 Ventricle IV 



Medulla (composite) 



Muscle segments 

 - Neural arch cartilages 

 Spinal cord (composite) 



tht-ir central cavity are seen in hori/ontal section, as also are 

 the fourth ventricle and the medulla oblougata. Other refer- 

 ences are given under PI. I. fig. 4. ( x 16.) 



FIG. 40. I! -ame double monster as 



in last figure, but at a I he section passes 



through t! but only through the 



upper segments of thf < niposite cnvitv of 

 the optic lobes will be seen to bifurcate in front, and ]>d into 



the cavities of the two forebrains. For other references see 

 under PI. I. fig. 4. (xi6.) 



The inner eyes 

 Recti superiores of above 

 Supraorbital cartilage 

 Cavity of cerebral lobes 

 Obliquus superior 

 Ventricle III 



Optic lobes 



Outer eye of right twin 



Lens 



Retina 



Rectus superior 



Cavity of optic lobes 



Optic lobes 



Periotic cartilage 



Semicircular canals 



Medulla 



Muscle segments 



Neural arch cartilages 



Muscle segments (inner) 



Notochord 



Spinal cord (composite) 



J. F. G. 



PL. X. 



