1 70 TUCKERMAN. [Vol. IV. 



ducts of the former open as usual on the free lingual surface, 

 while those of the latter discharge into the trenches at their 

 base and deeper part. Bulbs are not very numerous in the 

 papillae of this taste area, and are chiefly limited to the lower 

 part of the lateral wall, where they are disposed in five or six 

 tiers. One of the bulbs divided transversely to its longitudinal 

 axis (but probably not exactly at right angles to the true axis) 

 consisted of at least thirty-six cells. The bulbs do not form a 

 continuous zone, but are somewhat irregularly scattered round 

 the edge of the papillary wall. They vary greatly in size and 

 shape, one of the largest measuring 0.060 mm. in length and 

 0.039 n^'^- ^^ breadth. The mean length is probably 0.055 mm., 

 and the mean breadth 0.031 mm. A few scattered bulbs are 

 present in the epithelium of the outer wall of the trench where 

 it curves beneath the papilla, and it is not unlikely that they 

 may also occur at higher levels, although none were detected. 



The Lateral Gjistatory Orga^is. — I am not quite certain that 

 I had the foliate structure entire. The part in my possession 

 measured 5 mm. in length, and consisted of nine or ten folds, 

 the majority of which were bulb-bearing. The folds were not 

 separable into primary and secondary lamellae as in the Lepori- 

 dae, but were occasionally cleft for half their depth into two 

 quite equal portions, the interspace thus left being nearly free 

 from epithelium. The furrows separating the folds varied 

 greatly in width. Some of them were narrow above, but very 

 much dilated below, while others were narrow and of uniform 

 breadth throughout. The depth was fairly uniform, averaging 

 0.65 mm. Serous glands were exceedingly abundant, occurring 

 within the papillae as well as around them. The ducts were 

 plentiful, many of them being of small diameter but of unusual 

 length. They open at the bottom of the furrows and also at 

 the sides of the folds at different levels. A small bundle of 

 striated muscle-fibres terminated within the base of each fold. 

 The bulbs are disposed on the lateral area of the folds in seven 

 to nine tiers. They are likewise irregularly scattered in the 

 epithelium bordering their mid-furrow. In horizontal section 

 they are very closely packed. They measure 0.054 mm. in 

 length and 0.030 mm. in breadth, the gustatory pore having a 

 diameter of 0.0028 mm. 



The fungiform papillae bear bulbs. Some of them possess 



