Crustacea Malacostraca. 



By 



H. J. Hansen. 



Introductory Remarks. 



It will be useful to introduce the treatment of this sub-class with a discussion of various points of 

 importance. 



The investigations of the dngolf extended over the eastern part of the seas along the west 

 coast of Greenland from a point a little north of the polar circle to about 58 N. L,., two degrees south 

 of Cape Farewell, from there in a north-easterly direction towards Iceland, the waters round this island 

 and between Iceland and the Faeroes, lastly eastwards to a line drawn almost due north from the 

 Faeroes to Jan Mayen. It goes without saying that all the material brought home by the Ingolf 

 is included in the following pages, but I have also thought it right to include all the material which 

 other Danish expeditions, special zoologists or others not experts (officers of the navy or officials in 

 our northern dependency) have collected at Greenland, Iceland and the Faeroes, and which is preserved 

 in the Copenhagen Museum; further, I have included the species given in the literature as having been 

 taken within the region mentioned and which are not represented in our Museum, at least from those 

 areas. The waters included are thus the Davis Straits, Baffins Bay and the narrower seas north of 

 this to as near the pole as the <Alert and <;Discovery reached, the seas south of Greenland to ca. 

 58 N. L,., those along the east coast of Greenland to ca. 75 N. L,., the waters west of a line from the 

 Faeroes northwards to 68° N. L., 6 2 / 3 ° W. L,. and from there to Jan Mayen (at ca. 71 N. L., 8° W. L.), 

 the waters south and south-west of Iceland to ca. 60° aud the sea south and south-west of the Faeroes 

 likewise to about 6o c N. L. This work contains all that is known concerning the Malacostraca in the 

 region thus circumscribed, both what our Museum and the literature can show. 



Our Museum is rich in Crustacea — especially Malacostraca — from the Faeroes, Iceland and 

 especially Greenland, and it may be permitted to mention here the principal sources (apart from the 

 « Ingolf). At the Faeroes, Dr. phil. Th. Mortensen has made a very considerable number of dred- 

 gings from low water out to ca. 100 fm. ; a number of forms has also been received from Dr. med. F. 

 J or gens en. At Iceland, collections have been made especially by Dr. phil. A. C. J oh an sen and 

 Mag. sc. R. Horring both of whom have also made collections at the Faeroes during short sojourns 

 there; Mag. sc. W. Lundbeck has also collected a by no means small material in the Icelandic 

 fjords, and Vice-Admiral C. Wand el has brought home a number of forms from the deep water round 

 Iceland (and from Davis Straits); several others, as Mag. sc. A. Ditlevsen, Cand. mag. B. Saemundsson, 



The Ingolf-Expedition. III. 2. j 



