300 



A MANUAL OF DENTAL ANATOMY. 



rudimentary in Thylacinus, probably absent altogether in 



Dasyurus, and Phascolarctus, to being a large tooth retained 



in full use till the animal is nearly full grown in Hypsiprymnus. 



Within the group Carnivora, the dog and many others 



FIG. 126 



FIG. 127 ( 2 ). 



have a thoroughly well developed set of milk teeth, which 

 do service for some time ; in the bear the milk teeth are 

 relatively smaller, and are shed very early ; in the seal the 

 milk teeth are rudimentary, functionless, and are absorbed 

 before birth, so that in the specimen figured the milk incisors 

 had already disappeared (see Fig. 127). 



(*) Permanent and milk dentitions of a Dog ; the latter was well de- 

 veloped. Nat. size. 



( 2 ) Permanent and milk dentition of a seal (Phoca Greenlandia). 

 Nat. size. 



