Ihe following paper is chiefly based on the collections 

 of the Amdrup-expeditions to East-Greenland, as these col- 

 lections were rather rich, but also the collections of the Ryder- 

 expedition have been included into the paper, and mentions are 

 also made of the species otherwise known from the region; 

 thus the paper intends to give an enumeration of all the spe- 

 cies of Porifera hitherto known from East-Greenland. 



The Ryder-expedition took place in the years 1891 — 92, 

 and the Amdrup-expeditions in 1898 — 99 and in 1900, there- 

 fore the material, collected by the Ryder -expedition, and 

 belonging to the Homoi'rhaphidae, Heterorrhaphidae and the 

 first part of the Desmacidonidae was included in "The Danish 

 Ingolf-Expedition", Porifera, Part I, 1902 (containing Homor- 

 rhaphidae and Heterorrhaphidae), and Part II, 1905 (containing 

 the first Part of the Desmacidonidae), and the material from 

 the Amdrup-expeditions, belonging to the mentioned first part 

 of the Desmacidonidae was included in Part II of the Ingolf- 

 work; the species in question are therefore here only enume- 

 rated; the material from the Amdrup-expeditions, belonging 

 to the Homorrhaphidae and Heterorrhaphidae on the other 

 hand was received too late to be included in the first Part of 

 the Ingolf-work, and this material is therefore now treated here; 

 it contains one species, Gellius varius, not hitherto known 

 from the regions in question. 



I shall here make the remark, that of the stations of the 

 Ingolf-expedition I have only taken station 94, 64° 56' lat. N., 

 36° 19' long.W. with a depth of 204 fathoms into consideration, 



