VISUAL SYSTEM: STATE OF THE ART 



33 



Photo courtesy of Constance Warner 



Light-adapted eye of the bonnethead shark, Sphyrna tiburo (Linnaeus)— Sphyrnidae. 

 In contrast to the blacktip, this shark has a horizontal slit pupil. Plate No. IC 



Photo courtesy of Constance Warner 

 Partially dilated iris of the bonnethead shark. The pupil rounds up as it expands during 

 dark adaptation. Plate No. ID 



