Landacre, Taste Buds of Ameiuriis. 55 



longitudinal axis as the middle of the mandible and distal end 

 of the hyoid cartilage, so that they furnish the ventral buds for 

 the regions of the posterior palatine area (see Fig. I, Plate 

 I). The anterior end of this group remains almost stationary, 

 while the posterior limit moves back at almost exactly the same 

 rate as the most posterior buds on the gills. 



The innervation of these buds is segmental. Buds lying an- 

 terior to the union of the hyoid arch with the copula are inner- 

 vated by the ventral division of the post-trematic portion of the 

 ninth nerve, which runs along the copula between the union of 

 the first gill arch and the union of the hyoid (see Professor Her- 

 rick's note immediately below). 



Buds lying in front of the union of the first, second, third and 

 fourth gill arches, respectively, with the copula are innervated 

 by the dorsal division and the ventral division of the post-tre- 

 matic portions of the ninth and the first four branchiomeric 

 divisions of the tenth nerves, respectively, in Ameiurus, as in 

 Menidia, so that in each case the area in front of a gill arch 

 and extending as far forward as the union of the next anterior 

 gill arch is innervated by two nerves. Professor Herrick states 

 in his note (see below) that there is no segmentation of the buds 

 in the adult Ameiurus, but in my earlier series there is found a 

 well-defined segmentation of the median ventral ridge and of 

 the buds occupying it which indicates that possibly it may be 

 related in some way to the innervation. The segmentation of 

 the median ventral ridge and the grouping of taste buds is shown 

 in Table XVIII. 



In discussing the taste buds of the floor of the pharynx refer- 

 ence was made to C. J. Herrick's Menidia paper ('99). In 

 view of the need of more detailed information regarding the 

 innervation of the taste buds in this region. Professor Herrick, 

 in response to an inquiry of mine, has re-examined the termini 

 of a typical branchial nerve of Menidia, as seen in the third 

 gill, and also the distribution of the branchial nerves of the 

 adult Ameiurus. His report upon these two points is appended 

 in the following note: 



The Branchial Nerves of Ameiurus melas. 



The post-trematic division of the IX nerve as it passes into the first gill divides into two equal branches. 

 One follows the dorsal (concave) side of the branchial arch and one the ventral side, the latter being 



