HUMAN DENTITION. 455 



are relatively larger than in the Caucasian race. In Europeans it 

 is not unusual to find the fangs of the second and third inferior 

 molars connate along a great part or the whole of their extent, as 

 in PL 119, fig. 3. 



With respect to the reciprocal apposition of the teeth of the 

 upper and under jaw it is interesting to observe that the crown of 

 the lower canine is, as usual, in advance of that above, and fits 

 into the shallow notch between that and the lateral incisor. The 

 inferior incisors are so small that their anterior surface rests 

 against the posterior surface of the upper ones, when the mouth 

 is closed : the other teeth are opposed crown to crown, the upper 

 teeth extending a little more outwardly than the lower ones. 



Hunter remarks that the supernumerary teeth happen oftener 

 in the upper than the under jaw, and he believed them to be 

 always incisors or canines. I have seen a skull of a male Hindoo 

 in which there were two well-formed canine teeth placed side by 

 side in the left upper jaw, the series being very regular and even. 

 The wisdom-tooth is sometimes not developed ; but I never saw 

 a supernumerary premolar or molar tooth. 



174. Comparison of the deciduous teeth of the Orang, Chimpanzee, 

 and Human Subject. — The deciduous series of teeth in the Human 

 subject (PI. 121) consists of m. g, c. \E:], m. J-Ef : = 20. I shall 

 here describe them in immediate comparison with the same teeth in 

 the Chimpanzee and Orang ; because the differences, though less in 

 number and degree are more expressive of original specific distinc- 

 tion, in proportion to the immaturity of the subjects of comparison in 

 which they may be detected. 



The upper milk incisors of the Chimpanzee (PI. 120, fig. 1 .) 

 are relatively larger than in Man, especially the middle pair ; but 

 the disproportionate size of these is still more manifest and cha- 

 racteristic of the Orang (ib. fig. 2.) and the outer angle of the 

 lateral incisors is more rounded off in this Quadrumane. The 

 crown of the canine is longer, and more pointed in the Chim- 

 panzee than in Man ; still more so, and farther apart from the 

 incisor in the Orang. The first molar is as large in the Human 

 subject as in the Chimpanzee, and its crown is divided into two 

 principal cusps, but the outer and larger one has a small sub- 



