OF THE TONGUES OP THE MAMMALIA. 289 



the usual directions. The papillary bodies are flat or cylindrical, 

 and the number of points per papilla varies. 



Glands and Lymphoid Nodules (text-fig. 19 A, a). 

 At the sides of the epiglottis there are prominent nodular 

 masses with a few minute orifices of gland-ducts and pits. 



The Lateral Organs (text-fig. 19 F&G). 

 The lateral organs lie on the lateral borders (l.b.) and inferior 

 surface. They consist of short, broad, furrowed lamina? separated 

 by short, wide sulci. The laminae do not project (text-fig. 19 G). 

 The right organ is T45 cm. long, and has 9 laminae and 10 sulci. 

 The left organ is 1*3 cm. long, and has 7 laminae and 8 sulci. 



The Frenal Lamella (text-fig. 20 A&B). 

 The apex is entire and reaches- a point 3 mm. from the apex of 

 the tongue in my adult specimen, and 2 mm. in my young one 

 It is pointed or rounded. The edges reach as far back as the 

 middle of the lateral organs. 



THE PATAS GKOUP. 

 Species examined : G. patas • G. pyrrhonotus. 



The Patas Oekcopitheque (G. patas). 

 Habitat : West Africa. 



Three specimens were examined. and the following measurements 

 refer to the largest one :— Total length 4-8 cm.; length of the 

 oral part 4"3 cm. : length of the pharyngeal part -5 cm. ; width 

 between the lingual attachments of the palato-glossal folds 1'9 cm. 



In two examples the tongue is yellowish-brown in colour, but 

 in one it is unpigmented. The apex and lateral borders are 

 similar to those of the preceding forms, except that the apex has 

 a median notch as in G. mona. There is no median dorsal sulcus, 

 and the structures mentioned on page 278 are absent. 



The Circumvallate Papillce (text-fig. 21 A & F to I). 



Three papillary patterns are present in my three examples : — 



Specimen No. 1. — The three vallate papillae form an isosceles 

 triangle with an acute vertical angle. All are prominent, 

 especially the posterior one ; they are circular on plan and conical 

 on elevation, the broad ends of the cones projecting beyond the 

 Valiums (text-fig. 21 A, H, & F). All have granular surfaces. 



The vallate area contains several prominent fungiform papillae, 

 and is roughened by conical papillae. 



Specimen No. 2. — Four vallate papillae form a V. On the left 

 limb, including the posterior papilla, there are three, but the right 

 limb'has only two (text-fig. 21 I). The mid left papilla is small. 



Specimen No. 3. — Six papillae are arranged in the form of a V, 

 each limb of which has three elements. The most anterior 



