﻿110 JUEASSIC SPECIES OF AMMONITES AND BKACHIOPODA. [Feb. I9IO. 



their importance or otherwise, being often only a local accident of 

 alternating deposition and denudation. The net increase of deposit 

 must have been much less than 1 foot in a century, as this seemed 

 too rapid for the faunal changes involved. In conclusion, the 

 Author begged the Fellows to accept his thanks for their kind 

 reception of his papers. 



