The sponges treated in this paper were collected by the Danmark 

 Expedition at North -East Greenland in 1906 — 08. 



The material is astonishing small, only 12 species and also few 

 specimens; whether this circumstance is due to the fact that the 

 dredgings were nearly all undertaken in comparatively shallow water, 

 or to other facts, it is impossible to state. 



The material is for the greater part badly preserved, in not too 

 strong alcohol; hence the condition only allowed a study on skeletal 

 arrangement and on spicules: a purely systematic study. 



The methods employed have been the usual: dry cutting for 

 study on skeletal arrangements; isolating of spicules by means of 

 Eau de Javelle, which proved far better than Kaliumhydroxyd. 



Sponges were obtained at the following stations : 63, 64, 68 a, 

 72 b, 95 c, 96, 99, 104 b. 



The material is much loo small to yield matter for a discussion 

 on any biological topic, its value in itself is mainly to contribute 

 to our knowledge on arctic sponge-stock; but in connection with 

 the more considerable materials of other arctic expeditions (as that 

 of the Danish Ingolf-Expedition) it will also possess biological (mainly 

 zoogeographical) interest. 



As to the paper itself the following is to be said: 12 species are 

 mentioned: Calcareous: Leucosolenia coriacea Mont., Grantia arctica 

 H., Leuconia ananas Mont., Hexactinellides : Rhabdocalyptus arcticus 

 nov. spec, Asconema setuhalense Sav. Kent., Monaxonides : Halichondria 

 tenuispiculata nov. spec. Reniera cinerea Grant, Reniera laxa Ldbck., 

 Mycale thaumatochela Ldbck., Lissodendoryx indistincta Frstdt., Lisso- 

 dendoryx complicata Arm. Hans., Higginsia pyriformis nov. spec. As 

 will be seen, 3 of these are new species; the remaining 9 species are 

 so well known, described and figured that further report is super- 

 fluous. 



The figures are all drawn by myself, PI. XXV by means of Abbes 

 drawing-apparatus from Zeiss. The microscope employed was a Stativ 

 from Zeiss with acromatic systems, oculars of Huyghens. 



I shall here express my gratitude to the late Inspector G. M. R. 

 Levinsen of the Zoological Museum of Copenhagen, and to Inspector 

 W. Lundbeck, also of the Zoological Museum, for several valuable 

 hints concerning the preparing of this paper. 



36* 



