340 A MANUAL Of DENTAL ANATOMY. 



in Rodents, i.e., the convexity was outwards, and the apices 

 of their roots almost met in the middle line of the palate ; 

 it was this peculiarity that suggested the name. 



Another peculiarity in the molar teeth, in which they 

 stand quite alone, is that, like incisors, they have a partial 

 investment with enamel ; those referred to the premolar 

 series having it confined to their outer surfaces, while the 

 three back teeth of the molar series had a plate also laid on 

 to their inner surfaces ; there were seven molar teeth above, 

 and six below. 



In the interval between the incisor and molar series 

 canines have been found in the lower jaw ; they were sharp 

 edged, and had a partial distribution of enamel over their 

 surface. In an upper jaw alveoli for canines were found, but 

 the teeth themselves are not known. 



DINOCERATA. 



In the same region which yielded the toothed birds 

 (Eocene formations of Wyoming), the remains of many huge 

 animals have been discovered, for which new orders have been 

 proposed by Prof. Marsh (" American Journal of Science and 

 Art," 1876), it being impossible to classify them under any 

 existing order. The Dinocerata were creatures nearly as 

 large as Elephants, and presenting some general resemblance 

 to them in general form ; they were remarkable for the 

 relative smallness of their brains, which could apparently 

 have been drawn through the canal of the vertebral column. 

 They present points of resemblance to the Perissodactyle 

 Ungulata, and also to the Proboscidea, to which they were 

 at first referred, though their affinities are rather with the 

 former. 



The dental formula was 

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