2 TUCKERMAN. [Vot. II. 
median groove or raphé, except at the extreme posterior region. 
Here there is a wide and rather deep mesial groove, 2 mm. in 
length, beginning in front of the epiglottis and terminating 
midway between the two circumvallate papillee. 
In one of my specimens, near the line of union of the poste- 
rior and middle third of the tongue, is a rounded eminence, 
showing a tendency to a raised posterior part, as seen in the 
tongue of the Rodentia. This feature, however, is wanting in 
other tongues of Vesfertzlio which I examined. 
The upper surface, including the lateral margins, is covered 
with closely-set tactile and mechanical papilla, the points of 
which are directed backwards and inwards. 
The fungiform papillz are only fairly numerous, and are dis- 
tributed with some degree of uniformity over the dorsal surface 
and upon the sides of the tongue. Posteriorly they terminate 
in front of the gustatory area, and they cease anteriorly a short 
distance from the tip. Those scattered over the anterior third 
of the dorsum are usually larger than those occurring elsewhere. 
On each lateral half of the tongue, 2 mm. from the base, is 
situated a circumvallate papilla. The two papille are placed 
quite near the median line, the distance between them being 
only 0.6mm. They are oval in form, of nearly equal size, and 
are placed obliquely to the long axis of the tongue, their anterior 
extremity being directed outwards. 
A papilla of similar type to those just mentioned, but less 
developed and apparently in a transitional stage, is present at 
the posterior limit of each lateral border. Further investigation 
will be necessary to determine whether these papille are con- 
stant or not. In the specimens which I have examined I have 
always found them, although exhibiting striking variations in 
form, general appearance, and structure, from normal circum- 
vallate papillae. No papilla foliata was found. 
The under surface of the tongue is perfectly smooth. Ante- 
riorly there is a median ridge, with sloping sides, extending from 
the fraenum to the tip. 
GUSTATORY STRUCTURES. 
The Circumvallate Papille. — These papilla show no indica- 
tions of lobation. Their upper surfaces are rounded, and they 
measure 0.30 mm. in their transverse diameter, and are 0.22 mm. 
