TEETH OF QUADRUMANA. ^01 



of the true molars is manifested in tlie crown. In tlie 

 Stenorhynchus leptonyx^ each molar tooth in both jaws is 

 trilobed, the anterior and posterior accessory curving to- 

 wards the principal one, which is bent slightly back- 

 wards ; all the divisions are sharp-pointed, and the crown 

 of each molar thus resembles the trident or fishing-spear; 

 the two fangs of the first molar in both jaws are connate. 

 In the Stenorhyncus serridens^ the three anterior molars on 

 each side of both jaws are four-lobed, there being one 

 anterior and two posterior accessory lobes; the remaining 

 posterior molars (true molars) are five-lobed, the princi- 

 pal cusp having one small lobe in front, and three deve- 

 loped from its posterior margin ; the summits of the lobes 

 are obtuse, and the posterior ones are recurved like the 

 principal lobe. Sometimes the third molar below has 

 three instead of two posterior accessory lobes. Occasion- 

 ally, also, the second, as well as the first molar above, 

 has its fangs connate: but the essentially duplex nature 

 of the seemingly single fang, which is unfailingly mani- 

 fested within by the double pulp-cavity, is always out- 

 wardly indicated by the median longitudinal opposite 

 indentations of the implanted base. 



TEETH OF QUADRUMANA. 



The chief aim of comparative anatomy being the bet- 

 ter comprehension of the structure of man, w^e shall 

 finally describe those modifications of the dental system 

 which throw more immediate light on the nature of the 

 teeth in the human subject, and which are met with, as 

 might be expected, in the order (Quadrumcoia) of mam- 

 26 



