TONGUES 13 



tent. A peculiarity of one American genus {ArnUy- 

 stoma) is that the tongue is pleated or wrinkled on 

 top, and the folds or creases run from some point 

 within outward, as the spokes of a wheel. This point 

 may be in the center or toward the rear ; and its posi- 

 tion aids in distinguishing species. Here as elsewhere 

 the tongue is helpful in " diagnosing the case." 



In the Csecilians the tongue is like that of the 

 salamander forms — fixed to the floor of the month — 

 and can not be thrust out, as in legless reptiles. 



