510 



DR. C. F. SONNTAG ON THE ANATOMY 



base of the tongue are unpignaented, and the vallate and fungi- 

 form papillae may or may not be colourless ; in the former case 

 the appearance of the dorsum resembles that of Lagothrix 

 infumata (text-fi<:;. 37). 



The Circumvcdlate Papillce (text-fig. 45 A). — Three papillae 

 form an isosceles triangle with long sides, and an acute 

 vertical angle. The posterior papilla is granular and projects 

 considerably beyond the coarsely-nodulated vallum. The right 

 basal papilla is granular, and the vallum is overlapped by conical 

 papillje. The left basal papilla is round, granular, and pigmented. 



The Fungiform Papillce (text-fig. 45 A & C) form a narrow 

 dorsal bounding zone on which they have the usual arrangement, 



Text-fiffure 45, 



A. 



<^flY^N^ 



xfL 



M n^ 



The tongue of Callicehus molocli. 



but the transverse rows extend far forwards. Those on the 

 inferior surface are minute and form a single row. Some are 

 overlapped by conical papillae. 



The Conical Papillce (text-fig. 45 A & D) are all shaggy, and 

 stand up around the fungiform papillte when the tongue is dried. 

 The rows are mostly transverse, but the distribution according to 

 size is not according to the typical plan. All the papilloe are of 

 the filiform types. 



Lymphoid Nodides and Glands. — The base of the tongue'iis 

 occupied by nodules, but no orifices of ducts of glands are visible. 



The Lateral Organs (text-fig. 45 E), — The wide primary sulci 

 appear as incisions on the lateral borders, for the intervening 

 laminfe are flat. The}^ form a slightly concave row whose posterior 

 members are level with the lateral vallate papilla (l.v.p.). 



