PROBOSCIDEA. 567 



Andi-ews,* about the size of a tapir, with a third incisor and premolari- 

 form canine, and Sajhatherium Andrews and Beadnell. t These forms 

 al-e similar to those now existing, and present all the peculiar features 

 of specialisation of the order. The skull of a fossil species. Pliohyrax 

 (Procavia) hruppii, is known from tlie Miocene of Samos, and recently 

 Am3ghino lias described remains from the Cretaceous and Lower Eocene 

 of Patagonia under the namss of Archaeohyrax. Argyrohyrax, Plagiarthrus. 



Order 7. ' PROBOSCIDEA. J 



Large yachyderms with long proboscis ichich is used as a jyre- 

 hensile organ ; with large lophodont grinding teeth, and tusJcs in 

 the premaxillae or mandible. 



The peculiar gait of elephants is due to the fact that the legs 

 are not bent at the elbow and knee as is the case in most quad- 

 rupeds but as in Dinoceras and Titanotherium depend vertically 

 from the body. They walk with the tips of their toes on the 

 ground, but th^ weight is mainly carried by a great cushion on 

 the posterior surface of the digits, so that they may be described 

 as semiplantigrade. The toes are not separate externally but 

 their termination is marked by nails, Vhich are not, however, 

 always as numerous as the digits. 



The body is covered by a thick skin which in the living forms 

 is only sparsely covered with hairs. The head is enormous, 

 being short and deep, and the skull is swollen by air-chambers 

 in the frontal, parietal, premaxillary, maxillary, nasal, palatal, 

 and other bones. All these air-spaces communicate with the 

 nasal passages. The apertures of the external nostrils are 

 placed at the end of a long trunk, which is extremely mobile and 



* Andrews, Geological Magazine, 4, 10, 1903, p. 341. 



t Andrews and Beadnell, A preliminary note on some new mammals 

 from the Upper Eocene of Egypt, Cairo, 1902. 



{ Kaup, Description d'ossem. de foss. Mammiferes, 1832-35, Cah. Land 

 iv. ; Aden der Urwe.lt, 1841, 1. liartet, Sur la dentition des Prob. foss, 

 etc., Bull. Soc. Get>l. France, 1859, 16. Falconer and Cautley, Fauna 

 antiaua sivalensis, 1846. Falconer, On the species of Mastodon and 

 Elephant, fossil in Gt. Britain; Pt. 1, Mastodon, Pt. 2, Elephant, Quart. 

 Journ. Geol. Soc, 13, 1857, p. 308; and 21, 1865, p. 253. Falconer, 

 Palaeontological Memoirs, 2, 1868. H. v. Meyer, Studien lib. d. Genus 

 Mastodon, Palaeop.tograph.ica, 1867, 17. Weinsheinier, IJeber Dinotherium 

 giganteum, Palaeont. Abh. 1, 1883, p. 207. Forbes, Viscera, P.Z.S., 

 1879, p. 420. Adams, Monograph of the British Fossil Elephants, 3 

 pts., Palaeontographical Soc, 1877-8. Cope, The Proboscidea, Amer. 

 Nat., 23, 1889. Ameghino, PjTotherium. Bol. Inst. Geograf. Argentino,. 

 15, 1895, 18, 1897. Lydekker, Cat. Fos.". Mam. B. M., 1-5, 1885-7. 

 Andrews, C. W., Evohition of the Proboscidea, Phil. Trans., 196, 1904, 

 p. 99. 



