TEETH OF PHYSETER 



11 



alteration is to be noted. The terminal swelling — not particu- 

 larly strongly marked and so far like the first of this group of 

 sections which has just been described — is not in the same 



Text-fig. 6. 



* 



An early stage in the development of a tooth of the upper jaw. 

 This, with Text-figs. 7, 8, is to be compared with Text-fig. 5, 

 which represents three more or less equivalent stages in the 

 develoijment of the lower jaw teeth. The much greater length 

 of the dental lamina will be noted. 



straight line with the remainder of the dental lamina. It is 

 distinctly turned lingually at almost, or in some sections quite 

 at, right angles to the rest of the lamina. A further stage of 



