76 TUCKERMAN. [Vol. VII. 



round its lower portion in five to seven tiers, there being some 

 thirty-five bulbs in a tier. In the outer wall the number of 

 tiers is four or five, each tier containing about forty bulbs. 

 They traverse the epithelium obliquely, and measure 0.045 "^^n- 

 in length and 0.024 mm. in breadth. The lateral taste-organs 

 are very simple, consisting usually of a single fold, in the walls 

 of which a few bulbs are scattered. Serous glands are present 

 beneath the fold, but are not abundant. The fungiform papillae 

 as in M. dccumamis. 



The Tongue of Sciuropterus vohicella. 



General Description. — The total length of the organ is 

 17 mm., of which 5.5 mm. only is free portion. The tip is more 

 pointed than in Scinriis generally. The anterior dorsal groove 

 as usual. The circumvallate papillae form the usual triangle 

 (the posterior angle being very obtuse in my specimens). 

 Lateral organs are present, but inconspicuous. 



GUSTATORY STRUCTURES. 



The Circumvallate Papillce. — The papillae are about 0.25 mm. 

 in height. Their upper surfaces are somewhat uneven, and do 

 not rise perceptibly above the level of the adjacent area. 

 Serous and mucous glands are very abundant, the former occur- 

 ring within the papillae as well as beneath and around them. 

 Their ducts open into the trench at its deeper part. Bulbs are 

 not very numerous. They are disposed in three to five tiers, 

 the uppermost tier being about opposite the middle of the 

 trench. They measure 0.048 mm. in length and 0.024 mm. in 

 breadth. 



TJie Lateral Gustatory Organs. — Each lateral organ consists 

 of five fairly symmetrical folds. The furrows are quite uniform 

 in breadth, and average 0.30 mm. in depth. The main body of 

 the fold usually divides near the top into two portions, the 

 depression between being filled by epithelium. Serous glands 

 are plentiful, and their ducts open at or near the bottom of the 

 furrows. The bulbs are for the most part limited to the lower 

 half of the lateral wall of the fold. The average number of tiers 

 is six. The bulbs measure 0.045 ^im. in length and 0.021 mm. 

 in breadth. 



