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108

fathoms in the North Atlantic by the 'Albatross' in 1883-85, with the bathymetrical range of each species.

Species inhabiting the bottom or its immediate neighborhood.

Species probably not confined to the immediate neighborhood of the bottom, but showing structural evidence of inhabiting abyssal depths.

Doubtful, but probably inhabiting abyssal depths.

Species probably not inhabiting abyssal depths.

The structural and other characteristics of the deep sea forms are discussed at some length.