HOW THE QUAINT OLD FISHES OF ANCIENT TIMES HAVE LIVED ON INTO
OUR DAY 20
PICTURE-HEADING--Ideal restoration of _Pterygotus_, the huge
extinct sea-scorpion nine feet long; with the earliest
known fish _Pteraspis_, _Cephalaspis_, and small shark-like
animals swimming among Stone-lilies, Trilobites, etc. (From
various sources.)