EXPLANATION OF THE PLATES. 



PLATE LXIV, 



Fig. 1. Filiform papillae of the tongue near its centre, with 

 epithelial appendages attached. Magnified 41 dia- 

 meters. 



Fig. 2. Ditto of s.ame near its apex, with epithelial appendages 

 attached ; these are seen to be much shorter than 

 in the previous case. Magnified 27 diameters. 



Fig. 3. Ditto near the apex of the tongue, with the epithelium 

 removed, showing their cupped form, and the ar- 

 rangement and number of the secondary papillae 

 around their edges. Magnified 27 diameters. 



Fig. 4. Ditto near the centre of the tongue, in which situa- 

 tion the secondary papillae are seen to be much 

 longer and more slender than in the previous 

 figure, their apices falling together, and so ob- 

 scuring the excavation in the centre of each filiform 

 papilla. Magnified 31 diameters. 



Fig. 5. Filiform and fungiform papillae of the tongue, de- 

 prived of their epithelium. The size, form, and 

 structure of the fungiform papillae are well shown, 

 as well as the simple papillae situated in the fossa 

 around the base of one of the fungiform papillae. 

 Magnified 27 diameters. 



Fig. 6. Filiform papillae ; some deprived of their epithelial 

 processes, others still retaining them. In the centre 

 of the figure two filiform papillae may be seen oc- 

 cupying the position of a fungiform papilla, being 

 situated in a fossa studded with simple papillae. 

 27 diameters. 



Fig. 7. The centre of this figure represents a peculiar form 

 of compound papillae, occupying the position of a 

 x 4 



