94 



TUCKERMAN. 



form a row of ten or more, which extends across the entire 

 width of the summit. 



I failed to detect terminal bulbs in the sublingual plate in 

 Cebus or Macaciis. In Ateles, however, they are quite numerous, 

 especially in the fungiform papillas, where I have counted as 

 many as sixteen bulbs in a single vertical section. They are 

 also imbedded in the epithelium of the free margin to some 

 extent. One that I measured was 0.065 mm. in length ; the 

 average length, however, is 0.048 mm., the breadth being 

 0.030 mm. Non-medullated nerve-fibres enter the axes of the 

 fungiform papillas of the plate, and form a network beneath the 

 bulb-bearing region. Glands, presumably of the mucous type, 

 are present ; there being a main central clump and, near each 

 lateral border, a smaller one. It is highly probable, I think, that 

 the sensory terminal organs of the sublingual plate are tactile 

 rather than gustatory in function, 



A.MHERST, Mass., February, 1892. 



