Introduction. 



The Danish Ingolf-Expedition of 1895 — 96 brought home a ver>' considerable material of Mollusca 

 from the waters round the Faeroes, Iceland and South Greenland. The Expedition was planned on 

 the lines of a deep-sea investigation and the greater part of the material collected comes therefore 

 from great depths; of the 144 stations investigated no less than 125 have depths of over 100 fathoms. 



This material is naturally of great interest; the area investigated was but little known before 

 and an extension of our knowledge of the deep-sea fauna must be classed among the relatively rare 

 occurrences. 



Whilst working tip this material I felt appreciably the lack of information regarding the 

 distribution of tlie Mollusca in the coastal regions round a great part of the area. This does not 

 apply however to Greenland; on the west coast of that country collections have been made for many 

 years and the material has been worked up by H. J. Posselt, and from the east coast the gatherings 

 of the expeditions of recent years have been worked up by Posselt, R. Hagg, Ad. S. Jensen and 

 J. Grieg. From Iceland and the Faeroes, on the other hand, we had, just as previously for Greenland, 

 but incomplete and short lists of the species and, as these, mainly drawn up by O. A. L. Morch. 



This deplorable absence of material from the coastal region of Iceland and the Fjeroes has 

 now been made good. In 1892 and 1893 already Mag. scient. Will. Lund beck had collected a great 

 number of JMolIusca in the north-western fjords of Iceland during his voyage with the fishing-cutter 

 "Prinsesse Marie" and in recent years a number of the jounger naturalists, who have visited the P'aeroes 

 and Iceland, have willingly met my wishes and made a special effort to collect the Molluscs of 

 those regions. 



I may thus mention in particular, that in the summers of 1898, 1899 and igoi Mag. sc. 

 R. H or ring made considerable collections at the Faeroes and along the east and south-west coasts of 

 Iceland during his cruises with the fishery-inspection ship the "Diana"; further, that Dr. A. C.J oh an- 

 sen in 1900 brought home a large collection from the east and south coasts of Iceland, also made 

 during a summer cruise with the cruiser "Diana". In 1902 Mag. scient. A. Ditlevsen was sent out 

 with the "Diana", in 1903 Mag. scient. C. V. Otterstrom with the new inspection-ship "Beskytteren", 

 in 1904 Cand. magist. H. J. Gemzoe ("Reskytteren"), in 1905 Cand. F. Johanseu ("Beskytteren") and 

 in 1907 Cand. magist. O. Bornp ("Be.skytteren") ; all of these l>roug!it home collections, which helped 

 to throw light on the Mollnscan fauna of the Faeroes and Iceland. 



The Inoolf-Expedilion. II. i- I 



