EXPLANATION OF THE PLATES. 



PLATE LXVI. 



Fig. 1. A single caliciform papilla, with the epithelium 

 removed, showing the numerous secondary papillas 

 by which it is covered. 16 diameters. 



Fig. 2. Ditto, in a similar state, with the vessels of the pa- 

 pillae injected. 16 diameters. 



Fig. 3. Filiform papilla near the centre of the tongue, with 

 the vessels injected. 27 diameters. 



Fig. 4. Ditto near the tip of the tongue, also injected. 27 

 diameters. 



Fig. 5. Simple papillae, injected. 27 diameters. 



Fig. 6. A fungiform papilla, injected, surrounded by several 

 filiform papilla, also injected. 27 diameters. 



