GLOSSARY 211 



Multitubercular. A tooth crown having many tuber- 

 cles. 



Neck. The narrowest part of an object; the junction 

 of crown and root of a tooth. 



Oblique Ridge. The ridge running obliquely across 

 the occlusal surface of upper molars, from the mesio- 

 lingual tubercle to the disto-buccal. (It is the marginal 

 ridge of the primitive tritubercular molar.) 



Occlude. To strike against, as the striking of the 

 upper with the lower teeth. 



Occlusal. Applied to the grinding surface of the 

 teeth. 



Odontogeny. The generation or origin and develop- 

 ment of the teeth. 



Odontography. A description of the teeth. 



Odontophore. The strap-like organ of mollusks which 

 carries the teeth. 



Orthognathism. Having perpendicular facial lines, 

 i.e., near 90° ; as the European races. 



Paracone. The mesio-buccal cone (or cusp) of the 

 upper molars. 



Paraconid. The mesio-lingual cone (or tubercle) of 

 the lower molars, which has been lost in man and some 

 other mammals. 



Permanent Teeth. Those teeth which appear in child- 

 hood and are retained as the teeth of adult age. 



Placoid. Plate-like, as the scales and some kinds of 

 teeth of sharks and rays. 



Pleural. Pertaining to a pleuron or lateral part. 

 Applied to the lateral rows of teeth on the odontophore. 



Pleurodont. Having teeth attached by ankylosis to 

 the sides of the dental groove, as in some reptiles. 



Premolars. The succedaneous grinders between the 



