Mucous canal 

 Supraorbital cartilage 



Ventricle 1 1 1 

 Retina 



Cavity optic lobes 

 Supraorbital cartilage 

 Optic lobes 

 Cerebellum 

 Ventricle I V 

 Semicircular canal 

 Utricle 



Periotic cartilage 



Medulla oblongata 

 Canal of spinal cord 

 Spinal cord 

 Muscle segments 



Mucous canal 



Olfactory capsular cartilage 



Obliquus oculi superior 



Cerebral lobes 



Retina 



Lens 



Ventricle III 



Rectus oculi exte'rnus 



Ganglion nerve V 



Pons 



Periotic cartilage 



Parts of labyrinth 



Medulla 



Parachordal cartilages 



Notochord 



Muscle segments 



Olfactory capsular cartilage 

 Rectus oculi internus 

 • Obliquus oculi inferior 



Retina 



Optic chiasma 



Infundibulum 



. Rectus oculi externus 



Hypophysis 

 Hyomandibular 



Periotic cartilage 

 Saccule 



Gill cover 



Visceral arch cartilages 



Head-kidney 



Glomerulus of head-kidney 



Posterior cardinal vein 



Muscle segments 



Body cavity 



Swim-bladder 



J. K. G. 



