PART II. 



ECHINI 



EASTERN COAST OF THE UNITED STATES, 



TOGETHER WITH A REPORT ON THE DEEP SEA ECHINI COLLECTED 



IN THE STRAITS OF FLORIDA, BY L. F. de POURTALES, 



ASSISTANT UNITED STATES COAST SURVEY, 



IN THE YEARS 1867-1869. 



ALEXANDER AGASSIZ. 



Published by permission of Prof. B. Peikce, Superintendent U. S. Coast Survey. 



WITH FORTY-TWO PLATES. 



