TONGUES 13 



tent. A pecoliarity of one American genus {Ambly- 

 stomd) 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 CsBcUians the tongue is like that of the 

 salamander forms — fixed to the floor of the mouth — 

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



