196 



PLATE I. 



Figures all four times the natural size. 



Figure 1. Open mouth of Ambystoma microstomum. 



Figure 2. Open mouth of Pleihodon glutinosus. V. L, the vomerine teeth ; p. L, the 

 parasphenoidal bands of teeth. Above the vomerine bands are seen 

 the choanse. 



Figure 3. Open mouth of Spelerpes longicaudus, showing the vomerine and parasphe- 

 noidel teeth and the tongue. 



Figure 4. Koof of the mouth of Spelerpes maeulicauduR ; v., the hook-ehaped bands 

 of vomerine teeth ; p., the parasphenoidal bands. 



Figure 5. Open mouth of Desmognathus fusca; eh., the choanse; v., the vomerine 

 teeth; p., the parasphenoidal teeth ; L, the tongue. ' 



Figure 6. Open mouth of Diemyctylus viridescens, showing the two rows of vome- 

 rine teeth arranged in /\-form. 



