Art. XXIII. — Note on an Additional Genus of Fossil 

 Pla/nts found in the Bacchus Marsh Sandstone 

 by Geo. Siueet, Esq., F.G.S. 



By Sir Frkdeuick McCoy, K.C.M.G., M.A., D.Sc, 

 F.R.S., etc. 



[Eead 9th December, 1897.] 



Among the many important discoveries made by Mi-. George 

 Sweet, throwing light on the geological age of various formations 

 in Victoria, is a very interesting specimen obtained by him in 

 March, 1897, from the Bacchus Marsh sandstone, in which the 

 ferns of the genus Gangai)iopteris (McCoy) abound, with so few 

 traces of any other forms that the present discovery is of special 

 interest to geologists, bearing out the suggestions I have already 

 published, as to the age of the beds, from the data previously 

 known. It is a species of the large forms of the genus Tceniopteris 

 found in mesozoic formations in so many parts of the world. I 

 have much pleasure in dedicating it to the discoverer. 



Tceniopteris sweeti, McCoy. (Nat. size). 



Frond about three inches six lines wide ; mid-rib convex 

 above, finely and irregularly sulcated longitudinally, about one 

 line wide. Secondary veins very slender, about twice their 

 diameter apart; arcliing from the mid-rib at about 45 deg., 

 quickly running nearly parallel to each other in a direction 

 nearly at right angles to the outer edge of the frond on each 

 side ; chiefly simple, but some dichotomising once between the 

 mid-rib and the margin, more rarely dichotomising twice ; about 

 nine veins in quarter of an inch at the above widths of the frond. 



