Abstract
I am indebted to Professor Orville A. Derby for the opportunity of studying some fish-remains from the Cretaceous of North-East Brazil, which were examined by the late Professor Cope and partially described by him, without illustrations, in 1886. I had the privilege of seeing some of these fossils at Philadelphia in 1890, and made a few notes which were incorporated in the British Museum Catalogue of Fossil Fishes. I have now undertaken a renewed and more detailed study of the collection, which suggests the desirability of publishing the following supplementary observations.

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