The accompanying figure (1) represents a fossil in my possession obtained with some insect remains, by Mr. W. R. Brodie, of Swanage, from the Lower Leaf-bed of the Lower Bagshot beds, Studland Bay, Dorsetshire. It bears a general resemblance to the examples found by Mr. W. S. Mitchell, at Alum Bay and Bournemouth; and to those figured by Heer as Porana (Flora Tertiaria Helvetiæ, plate 103), from the Swiss deposits, except in its havingbut four instead of five lobes. It resembles somewhat in outline the recent Porana volvbilis, and, as the absence of the fifth lobe might be merely an abnormal Condition of the individual example, it seemed, at first, scarcely sufficient to separate it from the genus with which all the other similar forms from the Tertiary bedshad heretofore been identified.