252 Bulletin American Museum of Natural History. [Vol. XIII, 



Superior premolar i simple ; premolars 3-4 without antecrochet (thus differing 

 from 7'. aurelianensis); premolars 2-3 with small crista and crochet ; premolar4 

 with crista and forked crochet ; molar i with small crista, strong crochet, ante- 

 crochet reduced (as compared with R. aurelianensis); molars 1-3 with internal 

 cingulum extending around inner face. Inferior premolars with flattened outer 

 faces. Measurements, Mts. Ill = no. 



Dep^ret observes that the true T. brachypus always has an in- 

 ternal cingulum upon the upper molars. I do not, however, feel 

 convinced that this specific determination is correct. 



Halle : A distinct variety of this type occurs at Steinheim, 

 and was shown to me in this fine collection through the kindness 

 of Professor Fritsch ; it is distinguished by very thick enamel, 

 square posterior fold of ectoloph (due to the antero-posterior 

 compression of the dentition correlated with the brachycephalic 

 skull), crista, crochet, and antecrochet all showing in well worn 

 superior molars ; cingulum only around protoloph of molars 

 (in typical T. brachypus it embraces metaloph also). This vari- 

 ety may become known as a distinct species, T. eurydactylus^ for 

 there certainly are some minor differences between this and the 

 typical T- brachypus. 



Munich : The foot bones of manus and pes, Mtc. Ill = 145, 

 Mts. Ill = 1 10, astragalus = 50 (types of R. emydactylus Haushal- 

 ter), are almost identical in size and proportions with those of our 

 Upper Miocene species, T. fossiger Cope, of America. A lower 

 jaw (Steinheim) exhibits the following characters : symphysis, 

 short ; diastema very short, first lower premolar vestigial, single- 

 fanged, close to canine ; second lower premolar comparatively 

 simple, reduced, single-lobed. There is also a fragmentary skull 

 from the Dinotherium Sands near Giinzburg with occiput low 

 and broad as in T. fossiger. Also from Steinheim a large col- 

 lection of isolated upper molars, with the following characters : 

 superior fourth premolar broader than first molar (as in T. gold- 

 fussi)\ superior first molar with very thick enamel, a crista, large 

 antecrochet, and broad internal cingulum extending around pro- 

 toloph only. The Steinheim teeth of Munich therefore agree 

 closely with those in the Halle collection and indicate that the 

 northern {IT. eurydactylus) variety differed in a definite particular 

 from the southern typical T. brachypus race, namely : cingulum 

 extends around protoloph only; this character (cingulum around 



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