494 PROF. G. B. HOWES ON AN UNRECOGNIZED FEATURE [June 7 



these folds in either the Grass or Edible Frogs. I propose to term 

 them, in accordance with their position, epilaryngeal folds. 



At this stage two difficulties presented themselves. Firstly, as to 

 the epilaryngeal folds. Their condition, as seen in the Bull-Frog, 

 might conceivably be such as would have resulted from puckering 

 of a loose membrane under muscular contraction ; while their syra- 



FiK. 2. 



The larynx in Leptodacfyltis pe7itadactylus, (^, front yiew. Maguifiecl 

 two and a half times. 



Fig. 3. 



The larjnx in Rana pipiens, 5 > top view. Magnififid twice. 



ec/, epiglottis ; ep, epilaryngeal folds ; La, aditus laryngis ; t, tongue ; oe, ceso- 



phagus. 



metry and union in Leptodactylus pointed, no less distinctly, to the 

 conclusion that they were definite and permanent structures. Doubt 

 was dispelled on examination of other genera, for in a male of Cera- 

 tophrys americana (fig. 4) the two folds not only united behind but 

 gave rise to a clearly differentiated overhanging lip, ep., such as could 

 only have been a permanent structure. 



Secondly, as to the anterior folds, eg. As already stated, I at first 

 took these to represent the epiglottis of the higher Amniota ; but 



