THE VOYAGE OF H.M.S. CHALLENGER. 



recent Asteroidea, with their geographical and bathymetrical distribution, 

 and a full account of all synonyms and changes of name are given ; every 

 known starfish is believed to be included, and the recognition of "good 

 species " and " synonyms " is based on personal observation (except in the 

 case of some American types and a few recently described from the French 

 dredgings). 



The Report may be considered a monograph on the group, though of 

 course it need hardly be said that previously described and recognised 

 species are not re-described. An entirely new classification of the Aster- 

 oidea has been given — it was very unsatisfactory and quite unworkable 

 previously. 



All naturalists who appreciate careful and accurate work will join with 

 me in congratulating Mr. Sladen on the completion of his valuable memoir, 

 which extends to 935 pages, and is illustrated by 118 lithographic plates 

 and a map. 



John Murray. 



Challenger Office, 32 Queen Street, 

 Edinburgh, January 23, 1889. 



