Some years ago Dr. H. P. Blackmore called my attention to some fragmentary remains of shell on Echinoids which he had found in the Salisbury district. These he regarded as belonging to Hipponyx. The true relationship of these fragments could not, however, be considered certain until Mr. Dibley found the almost perfect example seen in Fig. 1. Dr. Blackmore's finds are recorded in the list of fossils in the “Cretaceous Rocks of England” (Mem. Geol. Survey), iii, p. 473, as “Salisbury,” but I have not discovered what form is there referred to under the localities of “East Kent” and “Margate.”