134 



The anterior tooth consists of six mastoid processes, forming 

 three transverse ridges, interrupted by a central depression ; but 

 the three inner processes are worn off obliquely, and the outer 

 half of the tooth is worn down to the base of the eminences. 

 Where the enamel is worn off, the dentine or bony matter within, 

 constituting the main body of the tooth, is covered with a black, 

 very hard, horny layer ; the hardness of this thin coating aids 

 the mastication of food, and materially retards the detrition. 

 This tooth is 4.2 inches long, measured over the inner row of 

 cusps, and 3.8 inches over the outer row ; its breadth anteriorly 

 is 3 inches, posteriorly 2.8 inches ; its circumference 14 inches. 

 There are two fangs, but the posterior one appears to be made 

 up by the union of two. The tooth is loose, easily removed from 

 its place in the alveola, and the extremities of the fangs are 

 much abraded ; the bone appears to be filling the socket from 

 below, so that this tooth is clearly deciduous, and would soon 

 have been shed. 



The next or middle tooth in the specimen exhibited, is the larg- 

 est and most prominent of the three, the length being 6.8 inches, 

 breadth 3.6 inches, circumference 19 inches. It has four ridges, 

 or eight cusps, and the rudiment of another ridge on the posterior 

 end. The three inner cusps are most worn, the anterior inner 

 one having entirely disappeared. This tooth is pressed closely 

 against the anterior tooth, as if crowding it forward, while it 

 stands entirely separate from the one behind. It is loose, but 

 cannot be removed from the socket. 



The posterior tooth is evidently in a growing condition. It has 

 four transverse ridges, each divided, in the usual manner, into 

 two cusps ; the last ridge is nearly hid beneath the bone, not 

 having yet fully crowded itself out. The two anterior cusps are 

 by far the largest and most elevated ; and the tooth is much the . 

 largest and broadest in front. This tooth is but very little worn, 

 and only on the two anterior prominences. Its breadth over the 

 anterior cusps is 3.6 inches ; over the last exposed cusps, 2.9 

 inches ; its length is about 6 inches, though this, and the circum- 

 ference cannot be accurately measured, on account of the con- 

 cealment of the posterior extremity. 



The aperture below the middle process of the front tooth is 



