CONTRIBUTIONS 



TO 



THE NATURAL HISTORY 



OP THE 



UNITED STATES OF AMERICA. 



BY 



LOUIS AGASSIZ, 



THIRD MONOGRAPH. 



[by ALEXANDER AGASSIZ.] 



IN TWO PARTS. — I. EMBRYOLOGY OF THE STARFISH. — II. HARD PARTS OF SOME 



NORTH AMERICAN STARFISHES. 



VOL. V. 



BOSTON: 



LITTLE, BROWN AND COMPANY. 



1877. 



