VIII 



published work of Delle Valle on the Amphipoda of the gulf of Naples. It 

 is most likely that some interesting statements about the geographical distri- 

 bution of the northern species are to be drawn from this work. 



For the exact identification and comparison of arctic species, I am 

 much indebted to Dr. Hansen, who with great liberality has sent me for 

 examination several of the type specimens originally examined by Kr03'er, and 

 ])reserved in the Museum of Copenhagen, as also many other interesting arctic 

 forms described by himself. 



I liave also to thank the Rev. Mr. Stebbing, Mr. Walker, the lie v. 

 Ml'. Norman, Mr. Chevreux, Mr. Schneider, and several other distinguished 

 zoologists for kindly sending me Amphipoda for examination and determination. 



My best thanks are also due to the pulilisher for the readiness with 

 which he has iintertaken the publication of such a large work, and for the 

 beautiful manner in which the present Volume has been mounted, lioth as 

 to tj'pe and paper. 



October 18!i4. 



G. (>. Sdi-s. 



