l6o TUCKERMAN. [Vol. IV. 



of taste in this species, but I think there can be but little doubt 

 of their existence. 



Gustatory Structures. 



The Circiimvallate Papillce. — The papillae are 0.40 mm. in 

 diameter and 0.95 mm. in height. Their upper surfaces are 

 more or less flattened, and their sides are vertical, or nearly so. 

 The trenches encircling them are narrow and very deep. Serous 

 glands are but sparingly present, and their ducts open at or near 

 the bottom of the trenches. At the lower part of the papillary 

 axis are a few isolated ganglion cells. The bulbs are disposed 

 on the lateral wall, often nearly filling it. They also occur to 

 some extent on the free surface of the papillae. The average 

 number of tiers appears to be about eighteen (though there may 

 be twice that number), a well-filled tier containing from sixty 

 to seventy bulbs. The bulbs show some indications of a neck. 

 They measure 0.054 mm. in length, their greatest transverse 

 diameter being 0.030 mm. No bulbs were detected in the 

 fungiform papillae or in the epiglottis. 



The Tongue of Dasypus villosus. 



I received three specimens of this tongue. They had been 

 kept in spirit, and the tissues were in a fair state of preserva- 

 tion. 



General Description. — The organ is long and narrow, and 

 tapers gradually to a point. It measures 81 mm. in length, and 

 is perfectly free for 50 mm. from the fraenum. At its posterior 

 part it is 12 mm. in breadth and 14 mm. in thickness. The 

 under surface is marked by a distinct median ridge leading from 

 the fraenum to the tip. The extreme basal portion of the organ 

 is bent somewhat abruptly downwards, as in Dasypus peba. The 

 upper surface is quite densely papillate over nearly its entire 

 area. Papillae of the fungiform type are sparingly scattered 

 over the dorsum and sides of the tongue. The two circum- 

 vallate papillae are on the same transverse line, and are set quite 

 close to the lateral margins of the organ. They are 7.3 mm. 

 apart, and 17 mm. from the base of the tongue. There is a 

 lateral gustatory organ at each side of the base. The organs 

 are marked externally by three or four small, irregular openings, 

 running transversely to the long diameter of the tongue. 



