WMemoirs of the Museum of Comparative Zodlogy 
AT HARVARD COLLEGE. 
Vout. XXXIX. No. 2. 
REPORTS ON THE SCIENTIFIC RESULTS OF THE EXPEDITION TO THE 
TROPICAL PACIFIC, IN CHARGE OF ALEXANDER AGASSIZ, BY THE 
U. S. FISH COMMISSION STEAMER “ALBATROSS,” FROM AUGUST, 1899, 
to MARCH, 1900, COMMANDER JEFFERSON F. MOSER, U. S. N., COM- 
MANDING. 
XV. 
ECHINI. 
ECHINONEUS AND MICROPETALON. 
By A. M. WESTERGREN. 
WITH THIRTY-ONE PLATES. 
(Published by permission of Georce M. Bowers, U. S. Commissioner of Fish and Fisheries. ] 
CAMBRIDGE, U. S. A.: 
Printed for the Museum. 
Aveust, 1911. 
