CONTENTS. 



REPORTS ON THE SCIENTIFIC RESULTS OF THE EXPEDITION TO THE 

 TROPICAL PACIFIC, in charge of Alexander Agassiz, by the U. S. Fish Com- 

 mission Steamer "Albatross," from August, 1899, to March, 1900, Commander 

 Jefferson F. Moser, U. S. N., Commanding. XI. Echini: The Genus Colobo- 

 CENTROTUS. By Alexander Agassiz. With viii., 33 pp. and 49 Plates. 



