THE NORWEGIAN NORTH-ATLANTIC EXPEDITION 



1876 — 1878. 



ZOOLOGY. 



S P O N G I A II Æ 



BY 



G. ARMAUER HANSEN, M. D. 



WITH 7 PLATES AND 1 MAP. 



CHBISTIANIA. 



PRINTED BY GRØNDAHL & SUN. 



1885. 



