. An introduction to the study of mammals living and extinct. Mammals. AMBLYPODA 437 and position to that of the !Musk-Deer, descended from each side of the upper jaw. These ^vere present in both sexes, but very much smaller in the female, as Avas also the flange-like process of the lower jaw by which they were guarded. Behind these, and at some distance from them, were on each side above and below six cheek-teeth, of comparatively small size, placed in continuoxis series, each with a pair of oblique ridges conjoined internally and diverging externally in a Y-like manner, and provided with a s
. An introduction to the study of mammals living and extinct. Mammals. AMBLYPODA 437 and position to that of the !Musk-Deer, descended from each side of the upper jaw. These ^vere present in both sexes, but very much smaller in the female, as Avas also the flange-like process of the lower jaw by which they were guarded. Behind these, and at some distance from them, were on each side above and below six cheek-teeth, of comparatively small size, placed in continuoxis series, each with a pair of oblique ridges conjoined internally and diverging externally in a Y-like manner, and provided with a stout basal cingulum. The normal dental formula was therefore ' §⢠'â T- /' 5- "' f = 34 ; and the dentition had thus already attained a remarkable degree of specialisation, although the Inain was smaller and more rudimentary in characters than in almost any other. Flc. 190.âSkeleton of Viixtathcruim »iira6i/(-. \j natural size. (From Mai-sh, .4»i. /oiirji. Soi. vol. 2.) known mammal. In its comparative length and the absence of a third trochanter the femur of these animals resembles that of the Proboscidea. The first discovered e\'idences of the existence of animals of this gi'oup were described by Leidy in 1S72. under the name of I'intaiherium (from the Uinta mouiitaias, ueai' which they were found). Subsequently the names Diiiociras. Timwras, Ltvo- lojthodoii, etc., have been applied to various members of the group, but the characters by which they are distinguished do not seem of sufficient importance to allow of their separation from the type genus Uiiiiatheiium.^ Corif^-ihodon.'-âAnother interesting form referred to this suborder is Cori/jihodon, which appeai-s to connect the Uinfafhtriidir \vith the most primitive Perissodactylu. It was fii-st described by Owen in ' For detailed descriptions and figures of this gix)iip, see ilarsli. '' Monograph of the Diuoeerata," jRr/. f".^. Giol. Sun: vol. x. ^lSSi\ - Owen, Br':. Fofs. Mamm. aiitl
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Keywords: ., bookauthorly, bookcentury1800, bookdecade1890, booksubjectmammals
