. Geological magazine. hich may be called Biplodocus lactistris, has much moreslender jaws than the one above described. A maxillary bone containseight teeth, and at the premaxillary suture measures 26* in thick-ness. The series of teeth occupy a space of 70™. A second speci-men of apparently the same species has since been found in Wyoming. The geological horizon of all the Sauropuda from the RockyMountain region is in the Atlantosaurus beds of the Upper Jurassic.!N^o Cretaceous forms of this group are known. Classificatioist. The main characters of the order Sauropoda, and of the threefamili
. Geological magazine. hich may be called Biplodocus lactistris, has much moreslender jaws than the one above described. A maxillary bone containseight teeth, and at the premaxillary suture measures 26* in thick-ness. The series of teeth occupy a space of 70™. A second speci-men of apparently the same species has since been found in Wyoming. The geological horizon of all the Sauropuda from the RockyMountain region is in the Atlantosaurus beds of the Upper Jurassic.!N^o Cretaceous forms of this group are known. Classificatioist. The main characters of the order Sauropoda, and of the threefamilies now known to belong to it, are as follows: Order Sauropoda.—Premaxillary bones with teeth. Large antorbitalopening. Anterior nares at apex of skull. Post-occipital bones. An-terior vertebrse opisthocoelian; pre-sacral vertebrae hollow; each sacralvertebra supports its own transverse process. Fore and hind limbsnearly equal; limb bones solid. Feet plantigrade, ungulate; five Geo). Mag. 188^. Decade,, la,.
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