500 DR. C. F. SONNTAG ON THE ANATOMY 



secondary sulci. In two specimens the following measurements, 

 etc., were observed : — 



Length. Lamince. Sulci. 

 Specimen No. 1. 



E,ight organ 1-1 cm. 9 10 



Left organ '9 cm. 10 11 



Specimen No. 2. 



Right organ 1-1 cm. 9 10 



Left organ o. '8 cm. 12 13 



The Frenal Lamella (text-figs. 38 B, a, and 39 D). — The tri- 

 angular lamella has a bifid apex, and the edges, which extend 

 postero-laterally as far as the middle of the lateral organs, may be 

 plain or have long sharp processes. The free part, which is 

 triangular on section (text-fig. 38 I), has a ridge on its upper 

 surface. 



The Ventral Papillary Border (text-fig. 38 B, h) is narrow, and 

 the arrangement of its conical and fungiform papillse has already 

 been described. 



Text-figure 39. 



The Ventral Mesial Stdcus (text-fig. 38 B, c and 0) is narrow 

 and deep anterior to the fi-enal lamella (text-fig. 38 A, c). 

 Posterioi'ly it is wide and triangular (text-fig. 38 C) and lodges 

 the ridge on the upper surface of the lamella. 



The frenimn is short and thick. It passes along with the 

 lamella into the wide part of the ventral median sulcus. 



The White-fronted Capuchin (C. alhifrons). 



The following vieasiireme^its refer to the larger of two 

 specimens : — total length 3"6 cm. ; length of the oral part 3-1 cm. ; 

 length of the pharyngeal part "5 cm. ; width between the lingual 

 attachments of the palato-glossal folds 1*6 cm. 



The Oircumvallate Pa2oill(B (text-fig. 40 A). — Three papillfe 

 form a triangle, but none are situated on elevations as in 

 C. fatuellus. The basal papillae are circular, glistening, and 

 slightly retracted, but the apical papilla is deeply re'cessed (a). 

 The fossae are all well-marked and the Valiums are nodulated. 

 The right basal papilla (h) is compound, but all the others are 



