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Vou. IX. DETROIT, JULY, 1889. No. 7. 
ORIGINAL COMMUNICATIONS. 
ON THE GUSTATORY ORGANS OF SCIURUS CARO- 
LINENSIS. 
[PLATE vu. | 
FREDERICK TUCKERMAN. 
N the tongue of most Rodentia the posterior portion rises some- 
what abruptly above the level of the anterior. The tongue of 
. carolinensis possesses this characteristic, although not especially 
well marked. The organ is 40mm. im length, 10mm. in breadth, 
and 8mm. in thickness, and is perfectly free for 17mm. from the 
frenum. The papillate surface is usually marked by a superficial 
longitudinal groove extending along the anterior half tothe tip. In 
some specimens the groove passes directly through the apex, and 
from thence is continued to the frenum. The dorsum, anterior to 
the area of the circumvallate papille, is thickly beset with small, 
recurved papillz of mechanical function. These papille vary in 
form, some being cone and others more or less cylinder-shaped. 
The latter measure 0.40mm. in height and 0.14mm. in breadth at 
their widest part, and, in the mid-dorsal region of the tongue, are 
about 0.35mm. apart. They are more or less flattened on top, with 
perpendicular sides, and each is seated upon one or more papillary 
upgrowths of the mucosa. The epithelium covering the papille is 
somewhat imbricated, and the spaces between them are filled to some 
height with epithelium likewise imbricated in arrangement. Not 
infrequently the papille have one or more cornified spines projecting 
from their upper surface, the points of which are directed inwards 
