Water Reptiles of the Past and Present

by Samuel Wendell Williston

THE UNIVERSITY OF CHICAGO PRESS
CHICAGO, ILLINOIS

Agents

THE CAMBRIDGE UNIVERSITY PRESS
LONDON AND EDINBURGH

THE MARUZEN-KABUSHIKI-KAISHA
TOKYO, OSAKA, KYOTO

KARL W. HIERSEMANN
LEIPZIG

THE BAKER & TAYLOR COMPANY
NEW YORK

WATER REPTILES OF THE
PAST AND PRESENT

BY

Samuel Wendell Williston

Professor of Paleontology in the
University of Chicago