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flatter than that of the shark, gives a longer focus, 



and accordingly the focal axis of the bulb is 



lengthened, the human bulb being spherical while 



that of the shark is flatter in front. The cornea in 



comeA 



sclera. 



Fig. 100. Diagram of Horizontal Section of the Right Human 



Eye (Simplified from Plate, after Luciani). 



(From Allgem. Zool., Gustav Fischer.) 



man is more convex and widely separated from the 



lens, which is entirely behind the iris, whereas in 



many sharks it protrudes through the pupil and 



touches the cornea. The human lens is much more 



delicate, less dense, more easily compressible than 



that of the shark and it readily responds to the pull 



of the ciliary muscles of accommodation. 



193 



