Note 492 — Chapter XIII
Reading edition
In Murchison’s Silurian System this form is figured (pl. xiv. figs. 8 and 9) and described as Paradoxides bimucronatus.
[493] This is described and figured as Asaphus tuberculatus in Buckland’s Bridgewater Treatise, pl. xlvi. fig. 6.
[494] We have also to refer to the indications of the existence of other large Silurian Entomostraca afforded by the magnificent series of fossil foot-tracks lately brought to England by W. E. Logan, Esq., and obtained by that gentleman from the Potsdam Sandstone (Lower Silurian) of Eastern Canada. These foot-marks and trails have been determined by Prof. Owen as being most probably referable to some large Crustaceans of the Limulus Group, and are named by him Protichnites. (See drawings and descriptions in the Quarterly Journal of the Geological Society, vol. viii.)