OF THE TONGUES OP THE MAMMALIA. 303 



extremities of the lateral organs. My largest specimen belongs 

 to the latter class and has the following measurements: — Total 

 length 6-6 cm. ; length of the oral part 5*4 cm. ; length of the 

 pharyngeal part 1'2 cm. ; greatest width 2"4 cm. 



The apex is rounded, has. no mesial notch, and hears conical 

 and fungiform papilla?, hut the latter are neither numerous nor 

 prominent. The fungiform papilla? on the lateral borders and 

 inferior surface are also insignificant and few in number. 

 • The following structures are absent : — mesial dorsal sulcus, 

 dorsal ridges, foramen caecum, lytta, and Apical Gland of Blandin 

 or Nuhn. 



The Circumvallate Papilla?. 

 The vallate papillae are arranged in the form of the letter Y or 

 "V", and I subjoin detailed descriptions of the vallate areas of 

 three specimens. 



Text-figure 27. 



: (lMjjj]hLj'<' ^&mf 



D. 



F. 

 The vallate papillae and lateral organs of Macacus sitiicus. 



Specimen No. 1 : — The vallate papillae form a V, with the angle 

 posterior. Each limb has two papillae, so, including the posterior 

 papilla, there are five altogether. Each papilla is circular and 

 prominent, its fossa is well-marked, and its vallum appears as a 

 clear zone. On examination through a lens the papillae and 

 Valiums appear granular. The middle papilla of the right limb 

 is displaced mesially, and there is a fungiform papilla between the 

 two mesial papillae, so a false appearance of a Y is produced 

 (text-fig. 27 A). 



Specimen No. 2 : — The papillae also form a V, but the limbs 

 differ greatly. Those of the left limb are close together, but the 

 mesial papilla of the right limb lies close to the posterior 



