OF THE TONGUES OF THE MAMiMALIA. 509 



The Frenal Lamella (text-fig. 43 B a, C a, & D a).— The tri- 

 angular lamella may have an entire or bifid apex. In the latter 

 the halves may be long and narrow, or wide and short. The 

 edges are plain or have processes. 



The Ventral PapillarT/ Border (text-fig. 43 B 6, C 6, & D 6) 

 is wider than in Cehus and Ateles. Its conical papillje are in hori- 

 zontal rows, but the fungiform papillaj form a single chain. 



The Ventral Mesial Sulcus (text-fig. 43 B c, C c, D c) may be 

 narrow and deep, or wide and shallow. It has no mesial crest. 



Humboldt's Woolly Monkey {L. humholdti). 



The tongue has three vallate papilise forming an isosceles 

 triangle ; of these the apical one is large. The fungiform 

 papillfe are large and conspicuous, and have the usual arrano-e- 

 ment in clusters and rows. The triangular frenal lamella has a 

 bifid apex. 



Genus Saimiris (=Chrysothrix). 

 The Squirrel Monkey (»S', sciurea). 



Measurements: — total length 2"1 cm.; length of the oral part 

 1-9 cm.; length of the pharyngeal part '4 cm. ; width between 

 the lingual attachments of the palato-glossal fold ]-l cm. 



The Gircumvallate Papillce. — Three papillae form an isosceles 

 triangle with tlie apex behind. The right basal papilla is 

 strongly retracted within its fossa, but the others are prominent, 

 granular, and surrounded by nodulated Valiums. 



The Conical and Fungiform Pajnllce have the usual arrange- 

 ment, and the latter form a doi-sal bounding zone. 

 ''■: Glands and Lymphoids Tissue are present as usual on the base 

 of the tongue, but no duct orifices are visible. 



Both lateral organs are 5 cm. long, and have five primary sulci 

 separating four laminae ; the latter are tiuversed by secondary 

 sulci. Each organ appears as a straight line of laminae and sulci. 



The frenal lamella, as shown by Pocock, is long, narrow, and 

 has a slightly divided apex. The frenum is long. 



Genus Callicebfs. 

 The Moloch Teetee (C. moloch). 



Three specimens were examined, and the oneasurements were 

 very similar in all. The following figures refer to my largest 

 example :— total length 2*55 cm. ; length of the oral part 

 2-15 cm.; length of the pharyngeal part -4 cm.; width between 

 the lingual attachments of the palato-glossal folds 1-2 cm. 



The tongue is bluish-black in colour on the entire oral part 

 and on most of the pharyngeal part of the dorsum. The inferior 

 surface has a bluish-black bounding zone. The frenal lamella, 

 mesial part of the inferior surface, and cuneiform areas on the 



