424 



BENNETTITALES 



[CH. 



the more probable, but this has not been demonstrated. There 

 are very few cases in which fronds of Zamites gigas occur in 



PIG. 541. Williamsonia gigas. Fronds (Zamites gigas) and flowering shoot, a, 

 attached to a stem (Bucklandia). (Yates Collection, Paris; nat. size.) 



organic connexion with stems, and we cannot with safety employ 

 other than a provisional generic term for fossil stems which it 



