Fio. 21.- 



nornuii t: > ' 



\ I .- ! 



various 



I tliL- central 

 >1 cord. Compart: 

 i, 40 (union at optic 

 ii;. 4j'( union at medulla). 

 and with I'l. XV. tig. 53 (in 

 pectoral region). For other references 

 see under PI. I. fig. i. (X13-) 



Mucous canal 

 Supraorbital cartilage 

 Cerebral lobes 

 Ventricle III 

 Retina 



Cavity optic lobes 

 Supraorbital cartilage 

 Optic lobes 

 Cerebellum 

 Ventricle IV 

 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 externus 

 . Ganglion nerve V 

 . Pons 

 . Periotic cartilage 



- Parts of labyrinth 

 ..Medulla 



. Parachordal cartilages 



. Notochord 



.- Muscle segments 



i ' I 



FK.. 23. < 



and the dorsal [ 

 pare 



medulla 

 PI. I. fig. i. 



' 





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. F. G. 



PL. V. 



v 



