ERRATA. 



Page lo, 20th line, for " month " read " mouth." 



Page 14, 13th hne from bottom, for "Lower Carboniferous" 



read "Later Carboniferous." 

 Page 179, 1 2th Hne, for "Plate III." read "Plate II." 

 Page 179, 2d- line from bottom of the page, for "Plate II." 



read "Plate III." 



