EYES OF CHOLOGASTER PAPILLIFERUS. 



Ill 



The dermis over the eye is thinner than elsewhere and devoid of pigment. The 

 epidermis passes directly over the eye without any free orbital rim. It is much 

 thinner, 24 /x in specimen 39 mm. long, than elsewhere about the side of the head 

 (50 to 60 /A) and consists solely of epithelial cells ; those at the base are columnar, 

 those at the free end of the epidermis are flat. All the other elements of the 

 epidermis goblet cells and mucous cells, very abundant all about the eye are 

 totally absent over it (fig. 35 a). 



n/tc. 



mSvM/^ 



* *% 2 * 



-.; : -^^l*A- .^--> ^V 



FIG. 35. (a) Section through Lower Left Half of Iris of Ciwlogaster papilliferus, seen from in front. 



t, iris; c, cornea; ep, epidermis; d, dermis; sub. o., suborbital. 

 (6) Section of Right Half of Head of Ciwlogaster papiltiferus. 

 (O Section through Retina at Entrance of Optic Nerve. 

 (rf) Inner Surface of Retina nearly tangential at Entrance of Optic Nerve, 

 (ej Vertical Section of Pigment Cells of Retina, depigmented with Chromic Acid. 

 (_/") Tangential Section through Pigment Cells. Upper part of figure passes through nucleated 

 part of cells, middle through processes of cells, and lower through cones only. 



