Fauna of the Arctic and Temperate Regions shall have been thoroughly 

 investigated, it will hereafter be found to embrace not less than 5,000 

 species. It was little suspected a generation ago that the Crustacea is 

 the class which undoubtedly embraces more forms than any other 

 outside the Insecta. 



The above summary will indicate the large gaps which remain 

 to be rilled in every order ; but I shall be especially obliged to those 

 Naturalists who can aid in making the collection more complete in any 

 of the following special points : 



1. Crustacea of the Black and Caspian Seas. 



2. Abyssal Atlantic forms. 



3. Grapsoidea, Carida, Schizopoda and Cumacea of the Mediterranean. 



4. Astacidae and Phyllopoda of Eastern Europe. 



5. European Land Isopoda. 



6. Amphipoda of Norway, Arctic Ocean, Abyss of Atlantic, and 



Mediterranean. 



7. Ostracodaand Copepoda of American Coast, and the Mediterranean. 



8. Parasitic Copepoda from the entire region, greatly desired, 



9 . Abyssal Atlantic Cirripedia, the Turtle Parasites, and Rhizocephala. 

 Of course all other species which are not in this list, will be most 



acceptable. 



March 3rd, 1886. 



