Landacre, Taste Buds of Ameiuriis. 



41 



TABLE XII. 



Table showing time of appearance of buds and extent occupied in the posterior palatine group. 



(A) From this table it will be noticed that the buds lying in 

 the roof of the wide palate posterior to those innervated by the 

 ramus pal. VII are found first in R at section 108. The poste- 

 rior boundary of this group moves back from section 122 in R to 

 170 in U, which brings it into contact with the roof buds lying 

 over the first gill arch. While the anterior boundary of this 

 group varies slightly, still the main movement of the group is 

 backward from the point of origin, i. e., from the position of the 

 peripheral buds innervated toward the more proximal buds. 



(B) The buds on the proximal portion of the hyoid arch 

 appear first in series R and spread from the ventralmost point 

 of appearance back up toward the proximal. I have taken as 

 the ventral limit of the hyoid group receiving the innervation 

 mentioned, the point where the hyoid cartilage becomes incorpor- 

 ated with the operculum, as distinguished from that portion 

 lying in the isthmus and constituting the distal or ventral por- 

 tion and receiving its nerve supply from the post-trematic divi- 

 sion of the ninth. 



I have grouped the buds of the proximal hyoid supplied 

 by the ramus pal. posterior VII with the oral group in order to 

 show the relation of that group to those buds and because it has 

 the same innervation; but it is altogether probable that the pos- 

 terior palatine group, the hyoid and suspensorial croups with 

 those of the distal hyoid and the floor of the pharynx form a 

 functionally complete group, since they occupy the same r.rea in 

 the longitudinal axis of the embryo. 



As mentioned above, the posterior palatine group undoubtedly 

 spreads from the distal toward the proximal areas innervated, 

 but in the cese of the hyoid and suspensorial groups the evidence 

 is not so clear. In the hyoid group the first bud is found in R at 



