50 



BLIND VERTEBRATES AND THEIR EYES. 

 Measurements {in microns) of eyes of Rhineura. 



MINUTE ANATOMY OF THE EYE OF RHINEURA. 



All the structures vary greatly in different eyes so that the terms "sometimes," 

 "usually," "frequently," etc., have to be used much more than is desirable. This 

 can not be avoided unless each eye is given a distinct description. 



A -A 



(a) Sagittal Section through Middle of Left Eye of Rhineura, about 300 mm. Ion?. 



(b) Vertical Section through Distal Part of Eye of Rhineura, showing Lens with Capsule. 



(c) Lens of Right Eye of Individu; ' 

 Left Lens of Same Individual. 



(c) Lens of Right Eye of Individual, 275 mm. long. Horizontal Section. 



(d) Le" " 



