On the Gustatory Organs of Sciurus hudsonius. 139 



fifths of one of the bulbs rest in a cavity of the mucosa. This bulb 

 is spheroidal in form (see fig'. 5), and measures 0,036 mm. in diameter. 

 The largest bulb detected in this region (fig. 6) measured 0,045 mm. 

 in diameter and was almost wholly epithelial in position. Bulbs were 

 likewise present on the posterior surface of the epiglottis (fig. 7), but 

 in size, shape, and general appearance, they varied but slightly from 

 those of the anterior surface. 



Explanation of Plate XI. 



Reference Letters. 



b Bulb. d. I Deep lamina of epithelium. F Furrow. Fd Fold of the papilla. 

 F. s Free surface of the epithelium, gl Serous gland, gl. d Duct of serous gland. 

 m Mucosa, s. I Superficial lamina of epithelium, s. p Secondary papillae. F Trench. 

 t. b Taste-bulb. 



Fig. 1 x 60. Vertical section through one of the circumvallate papillae. 



Fig. 2 x 250. Vertical section through one side of the base of the same circum- 

 vallate papilla, showing the bottom of the trench and seven tiers of taste- 

 bulbs, t. b Taste-bulb , the reference mark points to the apical end of 

 the bulb. 



Fig. 3 x 35. Transverse vertical section through one of the papillae foliatae. 

 Fig. 4 x 250. Vertical section through the summit of a fungiform papilla of the 

 mid-dorsal region of the tongue, showing a single taste-bulb at its upper part. 



Fig. 5 x 250. Transverse vertical section through the lower part of the anterior 

 surface of the epiglottis, b Bulb, lying partly in the epithelium and 

 partly in the mucosa. 



Fig. 6 x 250. Transverse vertical section through the same region of the epiglottis. 

 b Bulb, lying almost wholly in the epithelium. 



Fig. 7 x 250. Transverse vertical section through the lower part of the posterior 

 surface of the epiglottis, b Bulb, embedded in the epithelium. 



Amherst, Mass., U. S. A., 

 3. October, 1890. 



