IO 



INEZ L. \YHIPPLE. 



somewhat. Thus in Plctlicdon the groove gradually becomes 

 less distinct and finally flattens out and is lost upon the surface 

 of a slight labial eminence. 



o 



I have worked out the glands by dissection in several species. 

 They all show the same general character, and the position of 

 the orifices of two especially large glands with relation to the 

 naris is practically constant and similar to that in Desmognathus 

 (///, and ':.', of the figures). 



The location of the remainder of the orifices is difficult to de- 

 termine. The position along the mesial border of the naso-labial 

 groove, while a common one. does not seem to hold exclusive 

 possession in all species. The glands do, however, open always 

 in close proximity to the groove, and so far as I have been able 

 to determine, never within it. From the groove the glands have 

 the same mesial and lateral course, parallel with the lip. Some 

 of the glands are always extensive, usually reaching nearly or 

 quite as far posteriori}- as the eye. In Plcthodon several of the 



nl 



I . '., 



nld 



- .'.ion showing the naso-labial glands in place on unde: - : e of 

 skin removed from the right side of the head of an adult . A", the area 



.rtly from the intermaxillary gland and partly from 

 the r. - ^nations as in previous rig 



mesial tubules (Fie " turn dorsally before reaching the 



midline and extend posteriorly over the surface of the snout, in- 

 termingle with the intermaxillary, the tubules of which extend 



