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THE 



VOYAGE OF H.M.S. CHALLENGES. 



ZOOLOGY. 



REPORT on the Isopoda collected by H.M.S. Challenger during the Years 

 1873-76^ By Frank Evers Beddard, M.A. (Oxon), F.R.S.E., F.Z.S., 

 Prosector to the Zoological Society of London. 



PART II. 



PREFACE. 



The first part of ray Report on the Isopoda, which deals exclusively with the family 

 Serolidse, has already been published and forms Part XXXIII. of the series of Reports 

 on the Zoology of the voyage. The present Report contains an account of the species 

 belonging to the other families of Isopoda and completes the description of this group. 



I have purposely refrained from giving any detailed description of species already 

 known that were obtained by the Challenger, except in a few cases where it appeared to 

 me that a further description would be of some use as an aid in distinguishing the 

 species from closely allied forms. I have, however, in most cases referred to such 

 species, especially when they occurred in a new locality or at a greater depth than they 

 had been previously known to inhabit ; such -facts being of course important from the 

 general point of view of the Geographical Distribution of the group. 



The collection of Isopoda made during the voyage is very rich in new species and 

 genera, more particularly, as might be expected, in the deep-water forms, of which 

 no less than thirty-eight are new to science. Among the shallow-water species the 



(ZOOL. CHALL. EXP. — PAKT XLVIII. 1886.) Bbb 1 



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