While examining recently a collection of specimens from the flint-gravel of the Haldon Hills in the Museum of the Torquay Natural History Society, I discovered among them four containing casts of plates of Marsupites testudinarius. Moreover, in reply to enquiries, Professor Clayden, of Exeter, informs me that the Albert Memorial Museum there possesses five such plates, and that one was found by Mr. F. J. Collins, of Exeter, about three years ago, so that the fossil appears to be not uncommon in the Haldon flints, and consequently it seems worth while putting the fact of its occurrence on record, with some of the inferences that may be drawn from it.