Como beds must come up into the Lower Cretaceous of the European standards. There are differences of vast importance and must be carefully looked into. Stanton must as they found som. A later talk with Stanton does not seem to lead to such a conclusion. Brée also thinks that stantus than Montville faunas need revision and that his conclusions are bad. I tried to show that the Pacific faunas must be held apart from the Interior faunas. This might here that I think the Mexican and fails in not distinguishing provincial faunas. Should not hear feel either Brée or Burchardt that the Mexican faunas were other than a jumble of European, Mediterranean and even Asiatic faunas. This mainly on the basis of Ammonites. Is it possible that too much value has been given the Ammonites. In this connection I dought to look carefully into the recent work of Gretling on the development of one of the youngest Cretaceous Ammonites.