174 



THE GERM LAYER DERIVATIVES 



^ArCells of 

 vitreous 

 body 



Dptic'stalk Diocoel Mesocoe 



/ V ^ 



\ 



Pigmented Retina I Lens vesicle Pigmented layer 



layer 



Lens 



Lens fibers Lens epithelium 



V 



ID 



Presumptive cornea 



Lens epithelium 

 Lens fibers \ Ins 



Optic nerve 



Sclerotic Sclerotic f °'°'^ 



coat \ cortilage/ Lamina bosalis 



Outernuclear 



^Ti j laye 



\^x — I Inner nuclear 



.■^S \ layer 



r 



--Inner reticular 

 oyer 



|-^ Ganglion cell 

 \ layer 



iber 



Presumptive cornea 



Pigmented epithelium Rods and cones 



Development of the amphibian eye. (A,B,C) Progressive enlargements of 

 the 5 mm. stage. (D,E,F) Progressive enlargements of the 11 mm. stage. 

 (G,H,I) Progressive enlargements of the nietamorphic stage. 



