GLOSSARY 213 



Rugce. Folds or creases. Applied to the irregular 

 ridges of the membrane of the roof of the mouth. 



Scalpriform Incisors. The cutting incisors of the 

 rodents and other mammals. 



Sectorial Teeth. The cutting teeth of the Carnivora, 

 the long-bladed premolars and molars. 



Selenodont. Having longitudinal crescent-shaped 

 ridges, as a molar tooth. 



Septum. A partition of the alveolar process which 

 separates the alveoli. 



Stomacholiths. The calcareous plates found in the 

 stomach or gizzard of crustaceans, which carry cusped 

 or molar-like eminences. 



Succedaneous. Those teeth of the permanent set 

 which succeed or take the places of the temporary teeth. 



Sulcus (PL Sulci). A long, narrow channel, or fur- 

 row; a groove. Applied to narrow depressions and 

 grooves on the surfaces of teeth. 



Supernumerary. Having more than the usual or 

 normal number. 



Symphysis. The coalescence or junction of bones, 

 usually of symmetrical bones in the median line. 



Tcenio-glossa. A kind of gastropod having bent teeth 

 on the odontophore. 



Talon. The linguo-posterior prominence or heel of an 

 upper molar crown, bearing the hypocone. 



Talonid. The heel, or disto-buccal portion, of a lower 

 molar crown, bearing the entoconid, hypoconid, and 

 hypoconulid. 



Tetartocone. The linguo-internal cone; the fourth 

 cusp of the upper premolar. 



Tetartoconid. The linguo-internal cone of the lower 

 premolar. 



Theca, Pertaining to a sheath or case. 



