Report on the Malacostraca, P^'cnogonida and some Entomostraca. 565 



single species with certainty. We must also remember, that Green- 

 land extends over more than 20 degrees of latitude, so that even if 

 the list of localities for a species filled 2 — 3 pages, it would still be 

 ver}' incomplete. 



In the Zoological Museum of Copenhagen there is a large mat- 

 erial, still not worked up, of Crustacea from Greenland, especially 

 from the "Ingolf" Expedition (as mentioned, the only works published 

 are those on the Decapoda, Euphausidacea, Mysidacea and Pycnog- 

 onida) ; from the Swedish Expedition of 1898 — 99 to Spitzbergen and 

 East Greenland, under the direction of Prof. Nathorst, nothing has 

 as yet been published regarding the Amphipoda. 



In the following pages an endeavour will be made to subdivide 

 the Greenland Malacostraca into natural groups according to their 

 geographical distribution, and it is my hope, that this work, though ^ 

 in the nature of the case imperfect, will yet be able to give an 

 outline in the main lines correct of the zoogeography of the Green- 

 land Malacostraca. 



We can distinguish between the following faunas: 1. an arctic 

 and 2. an Atlantic deep-water fauna (> 200 m.); 3. a littoral fauna 

 (< 200 m.) and 4. plankton (for the sake of convenience all the Mys- 

 idacea and Euphausidacea are taken with the plankton, though a 

 few species, e. g. Mysis oculata, are really coastal forms). 



Where in the following no definite source is stated, this is as 

 a rule : for Decapoda, Euphausidacea and Mysidacea — H. J. Hansen, 

 "Ingolf" 1908, and "Fauna arctica" ; for Cumacea — Sars, "Account", 

 and "Fauna arctica"; for Amphipoda — Sars, "Account" and Steb- 

 bing, Tierreich ; for Isopoda and Tanaidacea — Sars, "Account", and 

 H. Richardson, "Monograph" 1905, and for Pycnogonida — "Fauna 

 arctica" and Norman, Podosomata 1908. H. J. Hansen, V. Grønland 

 1887, has been used for all the Malacostraca. 



1. The arctic deep-water fauna. 



This is distributed partly in the deep water north of the ridge 

 in Davis Straits (ca. 66° N., from Holstenborg in West Greenland to 

 Gape Walsingham in Baffin Land), partly in the cold area of the 

 Polar Sea. A number of the species from the cold area go eastwards 

 right into the Kara Sea and several are found at East Greenland in 

 quite shallow water. 



The large marine basin north of the ridge in Davis Straits is 

 one of the least known waters of Greenland. With regard to the 

 Echinoderm fauna Dr. Th. Mortensen writes (Report Echinoderms . . . 

 Danmark Expedition, Meddel, om Grønland, vol 45, 1910, pp. 292 — 93) 

 ". . . most probably, however, the fauna of the deep basin will prove 

 XLV. 40 



