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In both, as in the Bathymetrical regions of the South Atlantic, the Testacea of the depths are generally smaller and less brightly coloured than those inhabiting the shallows. During this voyage notes of the habitats of considerably more than a thousand species of Mollusca and Echinodermata were carefully registered. The following Catalogue is founded on the monograph of Helicidae by Dr. Pfeiffer.
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