Crustacea Malacostraca. IV. 





By 



H. J. Hansen. 



VI. The Order Cumacea. 

 I ntrod uct ion. 



Before entering on the subject of the present paper I may refer to "Introductory Remarks" in "Crustacea 

 Malacostraca I" published in iqo8, because they contain various statements that need not be repeated 

 here. In that chapter I explained the limits of the area investigated by the "Ingolf" and other Danish ex- 

 peditions to our northern dependencies; the principal sources (apart from the "Ingolf") for the material 

 examined were enumerated, and the principles followed as to "occurrence" and "distribution" were 

 laid down. Zoologists wishing to get some information on these and allied topics may find them in the paper 

 mentioned. 



Our earlier knowledge of the Cumacea living at the coasts of Greenland in depths down to nearly 

 a hundred fathoms was rather good, but as to the fauna of the deeper tracts of the adjacent seas it was very 

 poor. In 1887 I recorded 16 species, deep-sea forms included, belonging to the fauna of West Greenland; 

 in 191 5 K. Stephensen enumerated only the same number for both sides of Greenland. From the coasts of 

 Iceland onlv 2 species of Cumacea have been recorded (by G. O. Sars), and none from the Faeroes; from the 

 deeper tracts around Iceland and the areas north-west, west, and south-west of the Faeroes (southwards to 

 L,at. 6o° N.) scarcely more than a single species was known. In the present paper 66 species are enumerated, 

 and all, excepting 2 species from very deep water and not seen by me, have been secured by Danish expedi- 

 tions; 24 species are described as new. The "Ingolf" has gathered 41 species; 18 species have been taken 

 exclusively by that expedition, and 14 species are new to science. During the cruizes of the "Thor" Dr. Joh. 

 Schmidt brought together a magnificent material; he captured no less than 33 species (species secured at 

 places outside the "Ingolf" area not included); 16 of these species were taken exclusively by him, and 8 

 are new to science. Among the new species described on the following pages only 1 has been taken by two 

 expeditions, viz. both by the "Ingolf" and the "Thor". Only 9 of the 66 species have not been met with either 

 by the "Ingolf" or the "Thor"; 3 of them are new to science and have been gathered by the Ilnd Amdrup- 

 Expedition (Mag. sc. Soren Jensen), while the 2 species not seen by me were captured by the "Valorous" 

 (Rev. Canon A. M. Norman). Of course a number of the species taken by the "Ingolf" or the "Thor" have 

 also been gathered by various other Danish expeditions or collectors. 



The Ingolf Expedition. III. 6. 1 



