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DR. C. F. S0NNTAG ON THE ANATOMY 



11 laminae and 12 sulci. The left organ is 1*4 cm. long, and has 

 9 laminae and 10 sulci. 



The ventral papillary zone (text-fig. 17 B, d) is wide anteriorly 

 and narrow posteriorly, and its papillae have the usual arrange- 

 ment. 



Text-figure 17. 



D. 



The tongue of Cercopitliecus preussi. 



The Frenal Lamella (text-fig. 17 B, e). 



The triangular frenal lamella has a bifid apex, and a plain 

 upper surface. Its edges, which extend postero- laterally as far 

 back as the level of the middle of the lateral organs, are fused 

 posteriorly with the under surface of the tongue. They have 

 pointed processes anteriorly and tubercles posteriorly. In no other 

 species of Oercopithecus did I find such long, sharp processes. 



The median ventral sulcus is narrow and deep anteriorly, but 

 widens out posteriorly. It lodges a crest derived from the 

 frenum (text-fig. 17 B,/). 



In the fresh tongue the vessels on the base were seen, and they 



