34 



VISION 



Photo courtesy of Constance Warner 



Light-adapted eye of the nurse shark, Gingly mostoma cirratum (Bonnaterre)— Orectolo- 

 bidae. Orientation of the slit pupil in this shark is oblique. Plate No. IIA 



Photo courtesy of Constance Warner 



Partially dark -adapted eye of the cownose ray Rhinoptera bonasas (Mitchell)— Mylio- 

 batidae. Unlike most batoids pupil shape in this family with no trace of an operculum 

 pupillare. Plate No. IIB 



