In the early spring of 1910, while collecting in the Chalk quarry at Borstal, I found in a loose piece of chalk an impression of a small Gasteropod shell which probably belongs to the genus Lampusia. Shortly afterwards, while at the Borstal Manor Quarry, a workman brought me another small Gasteropod, which has since been identified as Turbo geinitzi, Woods. Both specimens were preserved as casts, showing part of the external ornament from near the apex to the basal whorl. Part of the zone of Holaster planus is exposed in the quarry, but the locality is not included in my previous list of exposures in the neighbourhood. The occurrence of these Gasteropods at such an horizon was almost conclusive evidence of the presence of the Reussianum fauna, so I again visited the quarry, in company with my wife, with a view to discovering the exact position at which these fossils occurred.