Landacre, Taste Buds of Ameiurus. 



23 



(a) Buds of the lower lip inside the mouth on the lower breath- 

 ing valve and on the mucosa of the mandible. 



In separating the buds of the extreme anterior portions of the 

 lip into those inside the mouth and those outside the mouth the 

 same arbitrary rule was followed as in the case of the upper lip. 

 Buds lying below the ventral border of the mucosa of the lip were 

 tabulated as on the outside of the body. It is not possible to 

 separate buds of this subdivision which lie on the lip from those 

 on the mucosa of the mandible. Meckel's cartilage extends 

 almost into the extreme anterior portion of the lip and there is no 

 perceptible difference between the epithelium of the lip and the 

 breathing valve and that of the mandible. 



Table VI shows the number of buds in this subdivision up 

 to series O', where there are 24. The backward movement of 

 the buds up to this time is not marked, although present; in later 

 stages buds extend much farther posteriorly and in the 20J mm. 

 embryo they occupy four-fifths of the total extent of Meckel's 

 cartilage. 



TABLE VI. 



Table showing time of appearance and extent of subdivisions A and B in the lower lip and the two 

 ventral barblet groups. 



The taste buds on the mucosa of the mandible are innervated 

 by twigs from the internal branch of the ramus mand. V. Those 

 of the middle of the lower lip and lower breathing valve are inner- 

 vated by the lip twig of the same nerve. This nerve also gives 

 off two twigs farther back for the mental and post-mental bar- 

 blets which acquire buds somewhat later. 



Buds on the edge ("lateral portion") of the lower lip are inner- 

 vated by the external branch of the ramus mand. V along with 

 those throughout the whole length of the outer surface of the 



