66 ODONTOGRAPHY. 



fourths of an inch : a notch exists at the end of each fang. A separate 

 drawing of this tooth is given in Plate VIII. Fig. 1. 

 second The second milk molar lies immediately behind the first, having the 



Tooth. 



same characters, but being larger. It has a small sharp anterior central 

 crest, two transverse bifid ridges, and a prominent heel, the inner half of 

 which forms a distinct ridge ; but, towards the outer edge, it slopes clown- 

 wards till it meets the neck of the tooth. The interspace of the transverse 

 ridges is much greater on the outer than on the inner side, and has a slight 

 triangular ridge in its interval. The height of the crown is an inch and 

 one-eighth ; the width across, an inch and a quarter ; from before back- 

 wards, an inch and three quarters ; circumference of the neck, five inches. 

 The fangs are two in number, an anterior and a posterior, extending the 

 entire width of the tooth, slightly curved, with a deep groove on the anterior 

 surface of the front fang, and the posterior surface of that behind. In the 

 interspace, both fangs are deeply hollowed ; the posterior is much larger 

 than the anterior, the reverse of the former tooth. The anterior fang is two 

 inches and one-eighth long, by an inch and one-sixteenth wide ; the pos- 

 terior is an inch and seven-eighths long, by one and a quarter wide. The 

 distance of the extremities of the tips from each other, on the outer side, is 

 one inch ; on the inner, seven-eighths of an inch : the lower extremity of 

 each fang is furnished with a deep notch. A separate drawing of this tooth 

 is given in Plate VIII. Fig. 2, and its situation shown in Plate II. Fig. 1. 

 Third The third tooth, deciduous like the preceding,* is the first three ridged 



six-pointed molar : smaller than the two other six-pointed molars, it is 



* This is called the third deciduous tooth ; but why it is more entitled to this epithet than the two 

 which follow, it would be difficult to determine. Are not the first and second so-called permanent teeth 

 equally deciduous, since they fall and leave the last permanent molar solitary 1 



Tooth. 



