Papers from Dr. Th. Mortensen’s Pacific Expedition 
1914 — 16 . 
I XV. 
I Sponges from the Auckland and Campbell Islands. 
, By 
H. V. Brøndsted, Birkerød. 
Introduction. 
This paper is an account of the sponges collected by Dr. Th. 
Mortensen at the Auckland and Campbell Islands during his Pac¬ 
ific Expedition 1914—16. All herein described forms are rather 
shallow-water sponges; the more astonishing is the number of spec¬ 
ies found, this faet apparently being due to the collector’s energy and 
practise. 
I am mueh obliged to Dr. Mortensen for his kindness in 
handing me over this interesting material. As might be expected 
there are several new forms in the collection. Among the Silicea 
only the Monaxonida are represented, the other groups mainly 
being deep-water form.s. 
The colour given is that of the sponges preserved in alcohol. 
MONAXONIDA. 
Family Homorrhaphida. 
Genus Halichondria, Flem. 
Halichondvia. inerustans nov. sp. 
Port Ross. The coast. 26/X1.1914. 
inerusting. 2 specimens, only fragments. Greatest extension 
27 mm, thickness 2—3 mm. Surface even, smooth; only in a few 
places the spicules pierce the dermal membrane, which is part- 
•cularly delicate and transparent, so that the numerous small sub- 
