THE TEETH OF MARSUPIALIA. 



423 



finding any uncalcified germs or other indications of any of 

 the missing teeth of the milk dentition. 



A further peculiarity of the Marsupials is the structure of 



FIG. 187 



jim 



their enamel, which is penetrated by the dentinal tubes. 



(*) Upper and lower teeth of the Thylacine. The rudimentary milk 

 molar, which is absorbed before birth, has been placed over the third or 

 last of the preinolars, which succeeds to it vertically. 



(-) Upper and lower teeth of a Dog, which are placed side by side with 

 those of the Thylacine to show the many points of resemblance between 

 the two dentitions. 



