Bulletin de l'Institut Océanographique 



(Fondation ALBERT I er , Prince de Monaco) 

 No 210. — 20 Mai 1 9 1 1 . 



The Genera and Species of the Order 



Euphausiacea, 



with Account of remarkable Variation 



BY 



H. J. HANSEN 



I. INTRODUCTORY REMARKS. 



Since 1904 the author of this treatise has examined a 

 vast number of Crustacea Euphausiacea from all oceans. 

 The material originates from the following expeditions 

 and Museums: the Danish « Ingolf » Expedition, the explo- 

 rations of the « Thor » until 1906, the cruizes of the Prince 

 of Monaco, the « Siboga » Expedition, the Belgian and the 

 Swedish Antarctic Expeditions, the exploring voyage of 

 Professor Agassiz 1904-5 in the East Pacific, the expedi- 

 tions of the «Travailleur » and the «Talisman », the 

 Copenhagen Museum, the U. S. National Museum, the 

 British Museum (containing above all the « Challenger » 

 collection), besides some material from the Bering Sea 

 and the North Pacific belonging to the Imperial Zoolo- 

 gical Museum in St. Petersburgh and the University of 

 California ; finally some interesting animals received from 

 the English Zoologists T. R. R. Stebbing, E. W. L. Holt 



