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 Kroyer, and 

 1 1 reserved in the Museum of Copenhagen, as also many other interesting arctic 

 forms described by himself. 



I have also to thank the Rev. Mr. Stebbing, Mr. Walker, the llev. 

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

 zoologists for kindly sending me Amphipoda for examination and determination. 



My beat thanks are also due to the publisher for the readiness with 

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

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

 to type and paper. 



October 1894. 



G. 0. Bar*. 



