FRANK E. BEDDARD 



ever, no other reason to doubt that the teeth rudiments were 

 Hke ^ those situated more posteriorly, which presented very few 

 such lacunae. Still, in attempting general statements concern- 



Tbxt-fig. 2. 



'** ^/^. 



Tooth of lower jaw. This figure and the two following are a nearly 

 continuous series, one section only lying between each section 

 figured. The mouth epithelium is seen to be ruptured owing 

 to the swelling of the tooth follicle, and the dental lamina with its 

 tooth germs to be dislocated towards the lingual side. The 

 dental papilla is no more than a closer agglomeration of the 

 mesoderm cells at the base of the tooth follicle. 



^ I could only find one series of teeth in the anterior part of the jaw 

 and these were quite early. The only difference from those which are 

 described more in detail below is that the actual tooth germ is longer 

 and more parallel with the residual lamina, and that the latter tends to 

 disappear between successive tooth germs ; there is thus an approximation 

 in structure to the teeth of the u^jper jaw. But the dental lamina remains 

 very short as in the posterior teeth of this jaw. These anterior teeth are 

 evidently more advanced in development. 



