8o TUCKERMAN. [Vol. VII. 



which falls away very abruptly to the base of the epiglottis, is 

 slightly wrinkled but devoid of papillae. The anterior dorsal 

 surface is impressed by a mesial raphe for about half its length. 

 The tip is obtuse, and the under surface smooth and marked 

 by a slight ridge extending from the fraenum to the tip. The 

 fungiform papillae of the anterior division are small and thinly 

 scattered over the dorsum. Those of the raised posterior part 

 are very much larger, and are enclosed between the two lateral 

 groups of circumvallate papillae. The latter, as usual, are 

 grouped in two portions between the median line and lateral 

 margins, those most posteriorly placed being 29 mm. from the 

 base of the tongue. Of the ten or eleven papillae on a side, 

 several are intermediate forms. The tongue possesses a rudi- 

 mentary lateral gustatory organ. The left lateral organ (the 

 right one was undeveloped) consists of three or four partly 

 differentiated folds, but is destitute of bulbs. The marginal 

 fringe of papillae was wanting. 



GUSTATORY STRUCTURES. 



The Circwnvallate Papillce. — The papillae are flattened on 

 top, and their summits are slightly retracted at the centre. 

 They vary greatly in size and general appearance. The larger 

 ones measure 1.35 mm. transversely and 0.80 mm. in height. 

 Serous glands are not abundant. The ducts open as usual. 

 Many of the papillae are but sparingly supplied with bulbs. A 

 few of them possess six to ten tiers, there being about ninety 

 bulbs in a tier. They measure 0.060 mm. in length and 0.036 

 mm. in breadth. Those of the fungiform papillae are smaller, 

 and measure 0.048 mm. in length and 0.030 mm. in breadth. A 

 few bulb-like structures were observed in the epiglottis. 



The Tongue of Bison americamis. 



General Description. — This specimen, of which the extreme 

 posterior portion was wanting, measures 283 mm. in length, 

 85 mm. at the widest part, and is free for 100 mm. from the 

 fraenum. The anterior dorsal surface is beset with sharply 

 pointed recurved cornified spines, similar to those of some of 

 the Carnivora. The fungiform papillae are thinly scattered over 



