502 DR. C. F. SONNTAG ON THE ANATOMY 



The Horned Capuchin {C. apella). 



F. J, C. Mayer (4) pointed out that the tongue lias four vallate- 

 papillfe, and nine sulci in the lateral organs. 



Podwisotsky (7) described six papillae arranged in the form 

 of a V. He also described the lingual glands which are well- 

 developed. 



Boulart and Pilliet (10), Ouvier (2), and Miinch (5) state that 

 the triangular pattern is the usual arrangement of the vallate 

 papillae in the genus Cehus. It is present in the majority of my 

 specimens, but the V-arrangement and double-pair type appear 

 in the remainder. 



Genus Ateles. 

 The Grizzled Spider Monkey {A. grisescens). 



Measurements: — total length 3'6 cm.; length of the oral part 

 2*5 cm. ; length of the pharyngeal pai-t I'l cm. ; width between 

 the lingual attachments of the palato-glossal folds 1'7 cm. 



Pigmentation. — The apex and a small area of the dorsum 

 behind it are unpigmented. Behind the latter the dorsum is 

 yellowish- brown, with a white cross in the centre. The long 

 limb of the cross is continuous with the colourless area behind 

 the apex, and each of the short limbs lodges a vallate papilla 

 (text-ilg. 37). The frenal lamella is colourless, but the rest of the 

 inferior surface is yellowish-brown. 



The Circumvallate Papillce (text-jSg. 41 A). — Three large 

 vallate papillae form an equilateral triangle with the apex behind. 

 The left basal papilla is compound, and consists of two elements ; 

 the right basal papilla is oval and excavated ; and the .posterior 

 papilla is circular. The fossae are well-marked, and the vallums 

 form clear zones. 



A fungiform papilla occupies the centre of the vallate area. 



The Fungiform Fapillce (text-iig. 41 A) form a dorsal bounding 

 zone on which they have the usual arrangement. Those lying 

 beneath the apex are large and closely aggregated, but the 

 transverse rows extend far forwards on the dorsum. 



The Conical Pajnlke (text-fig. 41 A) have the usual arrange- 

 ment in clusters and rows ; they increase in size in the usual 

 manner, and their points run in the usual directions. On the 

 pharyngeal part of the dorsum they are small and irregular. 

 On the lateral borders and inferior surface they have the usual 

 arrangements. Ail the papillae are small or of medium size. 



The Lateral Organs (text-fig. 41 0) extend from the dorsum to 

 the lower parts of the edges of the tongue. Each consists of 

 elongated fusiform laminae running forwards and upwards, and 

 the separating sulci are narrow. Each organ is surrounded by a 

 diamond-shaped unpigmented area. The right organ is "8 cm. 

 long, and has 5 laminae and 6 sulci. The left oi'gan is '7 cm 



