On the Gustatory Organs of Sciurus hudsonius 



by 

 Frederick Tuckerman. 



(With pi. XL) 



General Description of the longue. — The organ measures 

 28 mm. in length, its greatest transverse diameters is 7 mm. and, 

 anteriorly, it is free from the floor of the mouth for 11 mm. The 

 posterior division has a thickness of 6,5 mm., and is very slightly 

 raised above the level of the anterior division. The anterior dorsal 

 surface is impressed for some distance by a rather deep median groove 

 winch disappears at the tip. The greater part of the papillated surface, 

 including the lateral margins is covered with fine, closely-set, tactile 

 and mechanical papillae. At the extreme posterior region of the dorsum 

 are a number of coarse, fleshy, recurved conical papillae. Papillae of 

 the fungiform type are only fairly abundant. The are distributed over 

 the dorsal surface, and are sparingly scattered upon the sides of the 

 tongue. Near the base of the organ are three circumvallate papillae. 

 They are arranged in a triangle with the apex turned backward. 

 On each side of the tongue, near the base, is a well-formed papilla 

 foliata, the inner border of which is fringed with papillae, the latter 

 being continued on to the inner side of the base of the glosso-palatine 

 arch. Some of the papillae composing this fringe are relatively quite 

 large, measuring 3 and 4 mm. in length. The under surface of the 

 tongue is transversely wrinkled, but otherwise presents nothing of 

 noteworthy interest. 



