PREFACE. 



Mr. Spence Bate observes, — " In the production of the followmg 

 Catalogue, I have endeavoured to bring together, in systematic 

 arrangement, all the Amphipoda that are as yet known to science. 

 This, as far as practicable, has been attempted by descriptions and 

 figures taken from specimens in the British Museum ; but where 

 specimens have not been procurable, the description by the author, 

 or some reliable describer, of the species has been followed. In 

 order to adhere to a uniform nomenclature of the parts homolo- 

 gically the same, it has been found necessary to use diiferent terms 

 from those adopted by some authors ; but this, it is hoped, will 

 add to the clearness of the description without detracting from 

 the meaning of the author. In other cases, where the description 

 was too long to be quoted entire, the sense of the author has been 

 condensed into a description that coincides with the anatomical 

 characters of the Order. 



" The arrangement of the species in this Catalogue is the same as 

 the classification proposed in the British Association Report for 1855, 

 and adopted by Professor Westwood and myself in the ' British 

 Sessile-eyed Crustacea.' But observation during the progress of this 

 Catalogue has suggested a more natural arrangement by the absorption 

 of the Orchestida) as a subfamily into the Gammaridie, establishing 

 the Phoxides as a distinct family, and placing them between Coro- 

 phiida; and IIyi)eridaD. 



" I am indebted to many valued correspondents for specimens and 

 assistance, without which this Catalogue would have been far less 

 complete. My obhgations are expressed throughout the Catalogue in 



