EIGENMANN 



PLATE 22 



a. op. 



3-7 





B C 



A. Right eye of a Lucifuga, 69 mm. long. The pigment layer with choroid and sclera 



(/, chr. & set) is vesicular, walls of vesicle having shriveled somewhat. Section 

 is along optic nerve (n. op.) and shows large, round pigment mass (pi. sph.) 

 between pigment layer and lower part of retina. X 60. 



B. Left eye of adult, 93 mm. long. Eye has become very small, pigment layer 



incomplete. Very large mass of pigmented cells has accumulated over and in 

 front of eye ; strand of connective tissue (with nerve fibers) extends from front of 

 eye out toward surface. X 60. 



C. Oblique (lower) and rectus muscles sending common tendon to eye. From 



fish 44 mm. long. 



