214 COMPAEATIVE DENTAL ANATOMY 



Thecodont. Having fangless teeth, as a lizard. 



Tooth (PL Teeth). A specialized dermal structure, 

 situated in the oral cavity, containing a calcined osseous 

 tissue called dentin. 



Toxoglossa. Mollusks having arrow-shaped teeth. 



Transverse Ridge. A ridge extending across the 

 crown of a molar. 



Triangular Ridge. The ridge running down from the 

 point of a cusp or tubercle toward the center of the 

 crown. 



Triconodont. Having three cones in a line. 



Trigon. A triangle. Applied to the first three cones 

 of an upper molar. 



Trigonid. The first three cones of a lower molar. 



Trigonodont. A tooth having three cones in a tri- 

 angle. 



Tritocone. The mesio-buccal cone of the upper pre- 

 molars. 



Tritnbercidar. Having three tubercles upon the 

 occlusal surface. 



Truncate. Cut off or terminated abruptly. 



Tubercle. A small rounded eminence on the occlusal 

 surface of a molar ; a cusp. 



Tusk. A prominent incisor or canine which protrudes 

 some distance beyond the lips. 



Ulcini. The external teeth on the odontophore. 



