TEETH OF PHYSETER 



15 



of the tooth development was younger than that of the foetus 

 of Pouchet and Beauregard, and that therefore a definite 

 residual lamina could hardly he expected until a little later. 



Text-fig. 9. 



Tooth germ from iippor jaw at a more advanced stage of develop- 

 ment. The milk rudiment is long and conspicuous, expanded at 

 the extremity. 



The teeth of the upper jaw, however, though they show no 

 prolongation of the dental lamina precisely comparahle to that 



