No. I.] OBSERVATIONS ON THE GUSTATORY ORGANS. 89 



the trenches at their base or deeper part. The bulbs are quite 

 plentiful and to some extent occur in the outer wall of the 

 trench. They are disposed on the lateral area of the papillae 

 in twelve tiers. They are closely set in the tiers, some of them 

 containing upwards of one hundred and thirty bulbs. The mean 

 number is probably one hundred. The bulbs are small and 

 measure 0.045 rn^i- i^^ length and 0.026 mm. in breadth. 



The Lateral Gustatory Organs. — The organs are 4 mm. in 

 length and i mm. in breadth. The folds, some of which are 

 cleft at the summit, are quite irregular. The furrows are narrow 

 throughout, but vary much in depth, the average depth being 

 0.70 mm. Serous glands occur within the folds and beneath 

 them, but are not abundant. Their ducts open into the furrows 

 at their lower part. The bulbs are limited to the lateral walls 

 of the eight folds, where they are disposed in from ten to twelve 

 tiers. The character of the epithelium of the summit of the 

 folds is such as would render the development of bulbs in that 

 region highly improbable if not impossible. They measure 

 0.045 rnm. in length and 0.026 mm. in breadth. 



The fungiform papillae appear to be of normal structure. 

 Those about the tip are small, but bear one or two bulbs at their 

 upper part. In a papilla of the mid-dorsal region I have seen 

 in vertical section a row of eight bulbs extending entirely across 

 the summit. A well-developed bulb of this region measures 

 0.060 mm. in length and 0.032 mm. in breadth. 



The Tongue of Lemur tnongoz. 



General Desc7'iption. — The organ measures 43 mm. in length, 

 18 mm. in breadth, and is free from the fraenum for 14 mm. 

 The under surface is impressed by a short but deep median 

 groove extending in front of the fraenum. Papillae of the fungi- 

 form type are only sparingly scattered over the dorsum, but 

 about the tip they are much more numerous, the edge and under 

 portion being thickly studded with them. There are two pairs 

 of circumvallate papillae. The posterior pair are i mm. apart, 

 and 7 mm. from the base of the organ. The anterior pair are 

 3.5 mm. distant from the posterior, and are 6.5 mm. apart. The 

 lateral gustatory organs lie about as usual, their posterior end 

 being on a line with the posterior pair of circumvallate papillae. 



