Note AT — Chapter IX

This interesting ichthyolite has since been regarded by Agassiz as the representative of a distinct genus, to which he gives the name Pamphractus. As exhibited in his restoration, however, it seems to differ little, if at all, (if I may venture the suggestion,) from a Pterichthys viewed on the upper side. In Agassiz's beautiful restoration of Pterichthys, and his accompanying prints of the fossils illustrative of that genus, it is, with but one doubtful exception, the under side of the animal that is presented; and hence a striking difference apparent between his representations of the two genera, which would scarce obtain had the upper, not the under side of Pterichthys been exhibited. In verification of this remark, let the reader who has access to the Monographic Poissons Fossiles compare the restoration of Pamphractus (Old Red, Tab. VI., fig. 2) with the upper side of Pterichthys, as figured in this volume, Plate I., fig. 1, making, of course, the due allowance for a difference of species.