415 



[work from the port ERIN BIOLOGICAL STATION.] 



EEVISION of the AMPHIPODA of the L.M.B.C. 



DISTEICT. 



By Alfred O. Walker, F.L.S. 



With Plates XVIII. and XIX. 



[Read April 5th, 1895.] 



The completion of that portion of Prof. G. 0. Sars* 

 invaluable work on the Crustacea of Norway which 

 deals with the Amphipoda, has enabled me to name our 

 collection in accordance w^ith it, and at the same time to 

 correct a good many errors that had occurred in our 

 former lists. As Prof. Sars' work is likely to be the 

 standard for many years I have throughout adopted his 

 nomenclature for species described by him and would 

 refer any student of this class to it for descriptions. In 

 the case of species not described by him I have given 

 references to the best descriptions with which I am 

 acquainted. If I have occasionally ventured to differ as 

 to the validity of species with Prof. Sars I do so with the 

 full conviction that his knowledge of the Amphipoda is so 

 vastly greater than mine that in all probability he will prove 

 to be right. Many of these differences of opinion depend 

 upon the solution of the very difficult question whether 

 the Amphipoda, or some species of them, can become 

 sexually mature before they are full-grown. My own 

 opinion is that they can, and in support of this view I 

 have given various instances below of small females with 

 ova. If this be proved (and it can only be done by rearing 

 them through successive stages in aquaria — a difficult and 

 generally impossible process) it will enormously increase 



