PREFACE. 



The collection, of which this is a Catalogue, is restricted to 

 the Northern Arctic and Temperate Fauna. 



The area included embraces the Arctic and the North Atlantic 

 Oceans as far South as lat. 35 N., or to a line from Cape Hatteras, 

 in America, to a point just South of the Strait of Gibraltar. The 

 whole of the Mediterranean is included. On land it embraces 

 Greenland, Europe, and Asia, the last continent as far South, 

 roughly speaking, as lat. 38 N. ; but the Manchurian Province 

 and all Asia East of Lake Baikal is excluded. There are added 

 the Azores and the countries bordering on the South and East 

 shores of the Mediterranean. In fact it is the Palaearctic Region 

 of A. R. Wallace without the regions just indicated by latitude 

 and name. 



At the same time I have collected a little at Madeira, where 

 the Marine Fauna is interestingly illustrative of the Southern 

 distribution of many of our species, and thence were procured a 

 few other species which are entered here but are made known 

 by the letter M after the specific name. Similarly, being interested 

 in circumpolar distribution, a few species have been obtained from 

 the North Pacific, and these may be known by the letter P placed 

 after the specific name. 



I have here, for the first time in these Catalogues, distinguished 

 the species of which either the actual types or specimens named 

 by the describer are in my collection, by placing an (*) before the 

 name. 



This Catalogue, as far as p. 33, was printed three years ago, 

 but the finding and receiving from others such large additions 

 to my Crustacea led to the printing of the concluding part being 

 delayed until the present time. This accounts for the "Addenda" 

 given of species in Orders I XV, obtained since the beginning of 

 1902. 



The Catalogue is of sufficient extent, I trust, to be of use, 

 when interleaved, to Museums and private collectors for marking 

 their own collection, or inserting in MS. on the interleaved pages 

 such species as they may possess from the same area, but which 

 are not named here. 



