Landacre, Taste Buds of Ameiurus. 



57 



TABLE XVIII. 



Table showing the extent of the attachment of the hyoid and gills to the corpula expressed in 

 section numbers, the double segmentation of the median ventral ridge and the number of buds in each 

 segment. 



In Table XVIII the first double column gives the extent of 

 the ventral attachment of the hyoid arch and gills. The second 

 and third double columns give the extent of the two portions 

 of the ridge for each gill arch and the single columns give the 

 number of buds on each segment. 



In front of the union of the hyoid arch the ridge is continuous 

 and occupies the area of attachment of the hyoid, namely, 81 to 

 99, but between the point of attachment of the hyoid arch and 

 the point of the attachment of the first gill arch, there are two 

 separate portions of the mid-ventral ridge and its buds as indi- 

 cated by the boundaries 103 to ill and 113 to 117 which to- 

 gether are equal to the attachment of the first gill arch, namely^ 

 106 to 115. This double arrangement of the median ventral 

 ridge occurs between all the remaining gills and is only slightly 

 modified up to series U, where the ridge becomes continuous 

 between the posterior attachment of the hyoid and the attach- 

 ment of the first gill arch; but even here the ridge thins out in 

 the median portion indicating the point where the division had 

 occurred in N, so that the disappearance of this double arrange- 

 ment of the median ventral ridge begins anteriorly and extends 

 posteriorly. In the case of the second, third and fourth gill 

 arches, the ridge is still double in U. 



A segmental appearance of the buds is indicated here in the 



