OF THE TONGUES OF THE MAMMALIA. 511 



The entire organ is surrounded by an oval colourless area of 

 the tongue, so thej offer a marked contrast to the bluish-black 

 latei'al borders. 



The right organ is "6 cm. long, and has 10 laminfe and 11 sulci. 

 The left organ is "5 cm. long, and has 9 laminae and 10 sulci. 



The Ventrcd Papillary Zone is bluish-black and narrow. It 

 has many small irregularly-placed conical papillte, and a few 

 fungiform papillse in a single row posteriorly. 



The Ventral Mesial Sulcus is narrow and deep, and the frenal 

 lamella is triangular and entire with lobulated edges. 



The Brown Teetee (C hrunnea). 



In a hitherto unpublished paper Garrod states : " There are 

 three circumvallate papillfe in the form of a triangle. The fungi- 

 form papillse pre most numerous at the tip of the tongue, and 

 there are a few in front of the circumvallate papillae, and Mayer's 

 Organ. There is a good bifid sublingua" ( = frenal lamella). 



Owen (6) described a vallate triangle in C. 2Jersonata. 



Genus Actus (=]S'yctipithecus). 

 The Feline Douroucouli (A. felinus). 



The two specimens which I examined were preserved, so no 

 measurements were made. One of them has a single vallate 

 papilla. 



The apex and lateral borders have the usual characters, and a 

 well-marked mesial dorsal stdcus runs along the base of the 

 tongue. 



The Circumvallate Papilke (text-fig. 46 A &, C). — Two pro- 

 minent vallate papillae lie near the lateral borders. Each is 

 granular, and has a prominent nodular vallum. The fossae are, 

 well-marked. Both are round on plan and on conical elevation. 



The Fungiform Papilke (text-fig. 46 A & D; form a dorsal 

 bounding zone on which they have the usual arrangement. Some 

 are flush with the general surface of the tongue (o), but others 

 stand up prominently [a & h). They form a single row on the 

 ventral surface of the tongue, and some are overlapped by conical 

 papillae [d). 



The Conical Papillce (text-fig. 46 A & E) have the usual dis- 

 tribution according to size, and the usual direction of their 

 points. They do not have the usual arrangement, however ; on 

 the oral part of the dorsum they are iri-egular, but on the base 

 they form oblique chains. They are cylindrical or filiform, and 

 may have central depressions. 



The Lateral Organs (text-fig. 46 F). — The laminae and deep 

 narrow primary sulci lie on the edges and the inferior surface 

 of the tongue. They run forwards and upwards, and the laminae 

 are traversed hj secondary sulci. The right organ is *9 cm. long, 



J:>Roc. ZooL. Soc— 1921, No. XXXY. 35 



