Abstract
The existence of a group of fossil plants, combining in their organisation certain characters of the Ferns and the Cycads, has been recognised, of late years, by several palæobotanists, as, for example, by the late Professor W. C. Williamson, Count Solms-Laubach, Mr. Seward, and the author. The convenient name, Cycadofilices, has recently been proposed by Professor Potonié to designate the group in question, which now includes several, somewhat heterogeneous, genera, among which Lyginodendron, Heterangium , and Medullosa may be mentioned. Several species of the genus Medullosa (founded in 1832 by Cotta) have already been described, from the Permian and Upper Coal-measures of the Continent.
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