10 THE VOYAGE OF H.M.S. CHALLENGER. 



Bathymetrical Table. 



The bathygraphical distribution of the Keratosa appears very much altered by the 

 results of this Report, as is exhibited by the preceding complete list of the twenty-six 

 Deep-sea Keratosa here described, with notes on the localities and some general qualities. 

 Dr. Polejaeff, in his Report on the Keratosa, 1 has added a bathymetrical table (also 

 adopted by Vosmaer in Bronn's Klassen und Ordnungen, 1887, p. 455). This table 

 shows that most of the Keratosa are inhabitants of shallow water, and that no single 

 species goes down deeper than 400 fathoms. 



Twenty-three among the twenty-six new Deep-sea Keratosa here described are taken 

 from depths between 2000 and 2950 fathoms, three only (Psamminidse) in depths 

 between 1100 and 2000 fathoms. Twenty-two species are found in the Pacific (eighteen 

 in the Tropical Pacific), and only four in the Atlantic. 



1 Loc. ext., p. 73. 



