Having in my last communication presented the most recent views entertained by M. Coquand, I now proceed to mention those held by Monsieur Hébert, a most experienced observer, who has made the “Cretaceous system” a subject of particulat study. M. Hébert considers that M. Coquand has sepatated the period into too many definite divisions (étages), and in two papers published in the Bullettin of the Geological Society of France (Vol. 16 and 20, 2nd series), his views upon that topic have been fully recorded. He had not, however, drawn up any complete scheme of classification, but this he has now kindly done at my request. (See Table of Classification.)