On fossil reptiles from the governments of Perm and Vologda / by H.G. Seeley.

  • Seeley, H. G. (Harry Govier), 1839-1909.
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: On fossil reptiles from the governments of Perm and Vologda / by H.G. Seeley. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    dwana rocks of India, and these Permian rocks of Russia This wide distribution does not prove that the land was con- tinuous; of that there is no evidence: still less does such dis- tribution prove that the lacustrine and fluviatile deposits of Permian age were formed in a fresh water, which was con- tinuous. The fossil Reptilian life of these several regions is distributed over a number of isolated areas, each with its own peculiar fauna. The genera may he grouped under the order Anomodontia, but they vary with geographical distri- bution, just as the mammalian genera change when followed from one geographical region to another, at the present time. There is at present no proof that there is a genus in com- mon among the Reptilia of any two Permian land areas. In a later time there is similar geographical diversity in the wealden Reptiles, for between the Wealden Reptiles of Sus- sex and the Isle of Wight, few genera occur in common, while the genera, which differ, are many. Beside the evidences of ancient areas of land, which are thus of interest to the theory and facts of stratigraphical Geo- logy, there is a zoological or palaeontological interest in the reptiles, which range from the lower Permian and Permo- J Carboniferous of France, Texas, Elgin in Scotland, Russia, | India, up to the slight indications of Anomodonts in the Rhoe- tic beds of Linkfield near Lossie mouth on the Murray Firth. The Animals, named collectively Anomodontia, appear on the one side to approach closely to the Labyriuthodontia, and on the other side, the Monotremata. M. Amalitzky’s discoveries show that this diversity was nearly as conspicuous in Russia ] as in South Africa or America. | It has already been shown that types like Denterosaurus and Rhopalodon have many features of the skull in common with the Dicynodonts, yet the dentition is theriodont at least > in Denterosaurus, with the incisors, canines, and molars de- _ (2)