MUSEUM OF COMPARATIVE ZOOLOGY, 



51 



Teeth. — Last upper molar is double-rooted, and its crown directed back- 

 wards. All the other molars are single-rooted, with a slight median longi- 

 tudinal groove on the outside. Their crowns are irregularly conical, 

 pointed, and jut out over their contracted necks ; inner side of the crowns 

 hollowed. Surface of the crowns roughened with minute, longitudinal 

 grooves and ridges. The upper molars have no trace of the supplemental 

 points to the crowns seen in many species of this family. The lower 

 molars, particularly the third and fourth, have very slight accessory cusps. 

 Necks of the molars uniform in size with the upper part of the fangs. 

 Fangs of the molars gradually tapering, those of the first and second 

 upper much curved inwards ; that of the third less so ; that of the fourth 

 straight ; the two fangs of the fifth are directed abruptly forward, the 

 posterior one much the smaller. Canines of both jaws very large, the 

 upper, however, much the larger; the lower more curved. Of the six 

 incisors- of the upper jaw, those of the outer pair are much larger than 

 the middle ones, two thirds as long as the canines, and much like them in 

 form. The middle ones have their antero-posterior diameter nearly twiee 

 their lateral diameter, and their crowns are divided transversely. The 

 fangs of the inner pair are slightly bifid. Of the four lower incisors the 

 outer are much the longer. Figures 5-5 e (one half natural size), Plate I, 

 shows the form of the teeth, and the subjoined table their size.* 



Measurements of the Teeth. 

 A. — Teeth of the Upper Jaw. 



* These figures and dimensions (the latter given in millimetres) are taken from the 

 younger or middle-aged specimen, in which the dentition was perfect and normal. In 

 old age many of the teeth are usually broken, and a portion of them often entirely 

 wanting, through loss from accident. As the lower canines could not be removed with- 

 out removing a portion of the jaw, they have not been figured nor fully measured. 



t The distance from the crown to the alveolus^ _ 



\ The portion of the tooth inserted in the jaw. - 



§ At the base of the crown. 



