42 Journal of Comparative Neurology and Psychology. 



section 105 and the last in U at section 174, but the anterior 

 limit of the group also moves back from 105 in R to 152 in U; 

 and in the case of the suspensorial buds the same thing occurs. 

 The one bud found in S lies in section 144, while the first bud in 

 U lies in section 180. The only inference from this, barring the 

 loss of buds, which is altogether improbable, is that these struc- 

 tures are moving bodily away from the anterior end oi the em- 

 bryo. In the roof buds, as mentioned above, the anterior limit 

 is not so constant as in the anterior palatine group; still the first 

 buds in R and the first in U are within two sections of each other 

 while the posterior limit moves backward much more rapidly 

 than the relative increase in length of the embryo, which is from 

 ^.^^ mm. to 9.40 mm. 



II. SUMMARY OF THE ORAL AND CUTANEOUS GROUPS. 



TABLE XIII. 



Table showing the relative time of appearance of the various buds in the cutaneous, oral and pharyn- 

 geal groups. 



