THE EVIDENCE OF THE ORGANS OF VISION
Different kinds of eye--Simple and compound retinas--Upright and
inverted retinas--Median eyes--Median or pineal eyes of Ammocoetes
and their optic ganglia--Comparison with other median eyes--Lateral
eyes of vertebrates compared with lateral eyes of crustaceans--
Peculiarities of the lateral eye of the lamprey--Meaning of the
optic diverticula--Evolution of vertebrate eyes--Summary 68