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THE VOYAGE OF H.M.S. CHALLENGER. 



Family V. Halopsychidae, 

 Halqpsyche, Bronn, 



gaudichaudi, Souleyet, 

 Summary of the known Species of Gymnosomata, 



Geographical Distribution, 



Station List, .... 



General Conclusions, 



A. The Pelagic Provinces, 



B. Geographical Distribution of the Genera, 



C. The Species of Gymnosomata arranged in Provinces, 



Phylogenetic Relations of the Genera of Gymnosomatous Pteropoda, 



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