178 TUCKERMAN. [Vol. IV. 



and slender, and measure 0.060 mm. in length and 0.029 ^"oni- ij^ 

 breadth. 



The Lateral Gustatory Organs. — There is a somewhat strik- 

 ing resemblance noticeable between the gustatory folds of some 

 of the Chiroptera and a circumvallate papilla of the usual type. 

 In Pteropus this resemblance is less marked than in the genus 

 Vespertilio, the gustatory structures of which have already been 

 described in this yournal by the present writer. The organs 

 consist of three or four very irrregular folds of the mucosa. 

 The intervening furrows are fairly uniform in width, but vary in 

 depth, the average depth being about 0.60 mm. Serous glands 

 are not very plentiful in this region. Their ducts open at the 

 usual places. The bulbs are restricted to the lateral walls of 

 the folds, and not infrequently nearly fill them. I counted 

 upwards of twenty tiers, but the mean number is somewhat 

 less. The bulbs are of the same shape and size as in the cir- 

 cumvallate papillae. The marginal fringe of filiform papillae, 

 peculiar to this region in many mammals, has already been 

 alluded to. 



The fungiform papillae are well supplied with bulbs, and they 

 are also exceedingly numerous in the larynx, especially on the 

 inner surface of the cricoid and arytenoid cartilages. 



The Tongue of Nyctino^mis nasutus. 



The specimens had been kept in alcohol, and were in a fairly 

 good condition. 



General Description. — The shape of the organ suggests a 

 division into an anterior and a raised posterior part. The 

 posterior division is 6 mm. in length, the total length of the 

 organ being 11 mm. The anterior division is 4.2 mm. in 

 breadth, 3 mm. in thickness, and is free from the floor of the 

 mouth for 3.5 mm. The fungiform papillae are quite large on 

 the raised portion of the organ directly in front of the gustatory 

 area. They are also arranged in a line (for a part of the distance 

 in two rows) on each side of the tongue, at the junction of the 

 upper and lower surfaces. The circumvallate papillae, two in 

 number, are situated one on either side of the median line, 

 I mm. distant from the base. No search was made for the 

 lateral gustatory organs for want of sufficient material. 



