Erratum. — The number of the Plate (Plate XXI) used in the 

 Gkologioal Magazine for July, 1906, in illustration of Mr. Bernard 

 Hobson's article, p. 312, was by an oversight duplicated in 

 Dr. Wheel ton Hind's and Mr. J. T. Stobbs' paper (Plate XXI), 

 September Number, p. 394. Will readers have the kindness to 

 mark that in the July Number as Plate XXIa, and that in the 

 September Number as Plate XXIb : this will avoid the confusion 

 which might otherwise arise. A reference to these duplicate 

 numbers will of course be made in the list of plates in the December 

 Number. — Ebit. Geol. Mag. 



