The remarkable organs which are frequently associated with the Zamia gigas of Lindley and Hutton, and which have always been considered as in some way connected with the fructification of that plant, are the only fossils that can be referred to Cycadean fruits that have been hitherto observed in the Yorkshire Oolites, in which the remains of Cycadean leaves are so abundant. These organs have been made the subject of an elaborate memoir by Professor Williamson, presented to the Linnean Society some months since, and which it is to be hoped will soon appear in the Transactions of that Society. He has brought together so many observations, made during a life-acquaintance with these beds, that he has been able to re-construct, with every appearance of truth on his side, a singular genus, containing two well-marked species, and forming a new tribe of Cycadeœ very different from any living form.