Shortly after the appearance of my paper on “ Some Cretaceous Echinoidea from Jamaica ” (Geol. Mag., Vol. LX, 1923, p. 199) Dr. C. T. Trechmann returned from a further visit to the Island, bringing with him a considerable collection of Echinoids. These he has entrusted to me for examination and report, possibly with the hope that the Cretaceous specimens might induce me to change my heretical opinions as to the horizon present! Once again I have to express regret that I can only repay his kindness by expressing views similar to those previously given, and this time with far greater precision than before.