_Diplodocus._ The _Diplodocus_ nearly equalled the Brontosaurus in bulk and exceeded it in length. A skeleton in the Carnegie Museum at Pittsburgh measures 87 feet in total length; although the mount is composed from several individuals these proportions are probably not far from correct. The skull is smaller and differently shaped and the teeth are of quite different type. In the American Museum of Natural History, a partial skeleton is exhibited in the wall case to the left of the entrance of the Dinosaur Hall, and in an A-case near by are skulls of _Diplodocus_ and _Morosaurus_ and a model of the skull of _Brontosaurus_. The Diplodocus skull is widely different from the other two in size and proportions and in the characters of teeth. When the first remains of these amphibious Dinosaurs were found in the Oxford Clays of England, they were considered by Richard Owen to be related to the Crocodiles, and named Opisthocoelia. Subsequently the finding of complete skeletons in this country led Cope and Marsh to place them with the true Dinosaurs and the latter named them Sauropoda.[13] Remains of these animals have also been found in India, in German East Africa, in Madagascar, and in South America, so that they were evidently widely distributed. In the Northern world they survived until the Comanchic or Lower Cretaceous Period, but in the southern continents they may have lived on into the Upper Cretaceous or true Cretacic. Some of the remains recently found in German East Africa indicate an animal exceeding either _Brontosaurus_ or _Diplodocus_ in bulk. [Illustration: Fig. 24.--The Largest Known Dinosaur. Sketch reconstruction of _Brachiosaurus_, from specimens in the Field Museum in Chicago, and the Natural History Museum in Berlin.] At the date of writing this handbook only preliminary accounts have been given of the marvellous finds made near Tendaguru by the expedition from Berlin. From these it appears that in length of neck and fore limb this East African Dinosaur greatly exceeded either _Brontosaurus_ or _Diplodocus_. The hinder parts of the skeleton however, were relatively small. The proportions and measurements given tally closely with the American _Brachiosaurus_, a gigantic sauropod whose incomplete remains are preserved in the Field Museum in Chicago and to this genus the Berlin authorities now refer their largest and finest skeleton. If the Berlin specimens are correctly referred to _Brachiosaurus_ they indicate an animal somewhat exceeding _Diplodocus_ or _Brontosaurus_ in total bulk but distinguished by much longer fore limbs and an immensely long neck--a giraffe-like wader adapted to take refuge in deeper waters, more out of reach of the fierce carnivores of the land.[14] FOOTNOTES: [Footnote 11: The mounted Skeleton of Brontosaurus, by W.D. Matthew, Amer. Mus. Jour. Vol. v, pp. 63-70, figs. 1-5.] [Footnote 12: Professor Williston makes the following criticism of this theory: