| OCR Text |
Show 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 sym- Fig. 2. The larynx in Leptodactylus pentadactylus, 3, front view. Magnified two and a half times. Fig. 3. The larynx in Eana pipiens, 2 > top view. Magnified twice. eg, epiglottis ; ep, epilaryngeal folds ; l.a, aditus laryngis ; t, tongue ; 02, oesophagus. metry and union in Leptodactylus pointed, no less distinctly, conclusion that they were definite and permanent structures. Doubt was dispelled on examination of other genera, for in a male of Ceratophrys 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 |
