r)04 Dr. A. Aniljack-Cliristie-Linde on the 



Certain it is that there is material enough for giving rise to 

 a successional tooth. 



Between the morpliok)gica1 1'^ and the next fnnctional 

 tooth there is a distinct hud-shaped tooth-rudiment, repre- 

 senting the canine according to the general terminology 

 (text-Hg. 3). This is the first antemolar tooth-germ situated 



Fijr. 3. 



Surex arauei/g. — Fcetus (1 1 mm.). Upper jaw. Transverse section. C 

 witli milk predecessor (Cd). X 'J'JO. The left side of the figure 

 represents the lingual and the right the labial side of the jaw. 



within the confines of the ossifying maxilla, all the above- 

 mentioned tooth-germs Ijeing situated within the confines of 

 the ossifying premaxilla. This is at least tiie ease in the 

 foetal stage. How it is in the adult animal I cannot decide. 

 It may be, as Brandt* slates, that the premaxillo-maxillary 

 suture in the adult lies between the fourth and the fifth 

 antemolars. Yet for all that the functional fourth tooth is 

 not an incisor and the functional fifth tooth is not a canine, 

 but both are premolars, as will appear from the following. 



The tooth-germ of the canine not being visihle in the 

 reconstruction figure, 1 refer to the text-figure 3. 



The presence of a rudimentary canine excludes every 

 doubt that the following four antemolar germs represent the 

 premolars. The set of premolars is thus complete. P\ P^, 

 and P* are well developed, the two first-mentioned being 

 bud-shaped and the latter bell-shaped. P-, on the contrary, 

 is retarded in its development, and at this stage hardly 

 differentiated from the tooth-band (PI. XVIII. fig. 1). 



As to the molars, jNI^ and ^P are represented by distinct 

 tooth-germs, M' being bell-shaped, M* bud-sliaped ; ^P is 

 not yet distinctly differentiated. 



* Brandt, Ed., " I'ntersuchungen iiber das Gebiss der Spitziuaiise." 

 lliiUetin de la Societe inip^riale des Xatuialistes de Moscou. xliii. "J 

 llsro), xlvi. 2 (1873). 



