CRUSTACEA MALACOSTRACA. III. 



14 Epicaridea) are unknown from the "Ingolf area. In 1905 Tattersall enumerated 106 species belonging 

 to the fauna of Great Britain and Ireland, but only 46 of these have been found in the "Ingolf area, 

 and the majority of the remaining 60 species belong to the so-called Lusitanian fauna, and will never 

 be found at the Fseroes or Iceland. The numbers given may show that the seas around our northern 

 dependencies have been proportionately very well explored, but it is quite certain that numerous 

 smaller forms living in the warm area in depths from 400 down to nearly 2000 fathoms have not yet 

 been detected. 



On the Literature. 



The literature to be taken into consideration is very extensive, but only a little may be said 

 here. Only five works may be enumerated, as they were of special importance to the present task, 

 and in my references their titles have been extremely abbreviated in order to save space. 



The main work is G. O. Sars: An Account of the Crustacea of Norway. Vol. II. 

 Isopoda. 1899 (in reality 1896 — 1899). On the following pages it is quoted a hundred times, and, 

 though some errors and several deficiencies are pointed out, the enormous value of this fine and highly 

 instructive standard work must be emphasized. 



G. O. Sars: The Norwegian North-Atlantic Expedition. Crustacea, I. 1885, and 

 II. 1886. — It contains elaborate descriptions of several forms, and a good deal about distribution. 



Harriet Richardson: A Monograph on the Isopods of North America. 1905. (Bull. 

 U. S. Nat. Museum, No. 54). The value of this book for the "Ingolf" paper was especially due to its 

 enumerations of geographical distribution, and to its very complete and accurate lists of synonymy. 

 The abbreviation used on the following pages is: Monograph. 



W. M. Tattersall: The Marine Fauna of the Coast of Ireland. Part V. Isopoda. 

 1905. (Fisheries, Ireland, Sci. Invest, 1904. II). This paper contains descriptions with figures of some 

 interesting animals also captured by the "Ingolf or the "Thor", and statements on the occurrence 

 of numerous species. The abbreviation used by me is: Isopoda. 



K. Stephensen: Gronlands Krebsdyr og Pycnogonider (Conspectus Crustaceo- 

 rum et Pycnogonidor um Groenlandiae), in "Meddelelser om Granland. XXII. 1913". This is a 

 useful compilation of all earlier statements in the literature on the occurrence of the animals at Green- 

 land, together with lists of synonymy and distribution outside Greenland. On the following pages it 

 is quoted as: Conspectus. 



Results and Questions. 



A. The Material. 

 A comparison of the Isopoda of the "Ingolf" area with the world's fauna of the same order may 

 be of some interest. Caiman (1909) divided the Isopoda into six sub-orders; of these the Phreatoicidea 

 have no representative, and of the rich sub-order Oniscoidea only a single species of Ligia is to be 

 mentioned. But of the four remaining sub-orders some families, as Asellidse, Stenetriidse, Serolidae, 

 Entoniscidse and three small families of the sub-order Valvifera are to be discarded ; of the big family 

 Cymothoidse, comprising eight sub-families, only two sub-families, viz. Cirolaninse and ^Eginse occur in 



