70 EDWARD B. POULTOX. 



to near the extremity, which has an elliptical form. Its length 

 is 3 inches from root to apex, and it is quite free for nearly 2 

 inches from the frsenum, and thus capable of great freedom of 

 motion. 



I thus had rather less than a quarter of the length of the 

 tongue, but probably including all the most interesting details. 

 At the posterior part of the papillate surface are three large 

 circumvallate papillae, each situated at the angle of an isoceles 

 triangle with the base directed forwards, and 4"75 mm. in 

 length (measured from the centres of the papillae), the sides 

 being 2 5 mm. in length. The papillae themselves are about 

 1 mm. in diameter, and are encircled by a peculiarly deep and 

 narrow trench. 



The general surface in front of these three papillae is densely 

 covered by very small papillae, of a type which I believe to be 

 entirely peculiar. Each papilla is crowned by a circlet of 8 — 

 10 fine, long, bristle-like filiform papillae, whose points are 

 directed backwards, thus causing a slight roughness to the 

 finger when drawn from behind forwards. Thinly scattered 

 among these excessively numerous papillae are others of the 

 *' fungiform" type, of which about twenty were present on this 

 piece of the tongue, but as they were more thickly placed in 

 the front part they are no doubt commoner on the organ in 

 front of this piece. They are chiefly arranged as an irregular 

 single line on each side, beginning about 75 mm. in front of 

 the circumvallate papilla on the same side ; but they also occur 

 on the upper surface, about 11"5 mm., in front of two anterior 

 circumvallate papillae. Their appearance is quite normal. 

 Beneath the lateral row of fungiform papillae (of which the 

 papillae are separated by the small peculiar papillae) is a row, 

 from two to three deep, of large filiform papillae of ordinary 

 appearance, and beneath these the papillate surface ends 

 abruptly in a perfectly smooth epithelium. These rows of 

 filiform papillae are continued backwards and upwards until 

 they meet at the circumvallate papillae, between and around 

 which they are thinly scattered, and are also longer than else- 

 where. 



