No. I.] OBSERVATIONS ON THE GUSTATORY ORGANS. 91 



The fr^enal process or sublingual plate noted by Hunter in 

 Lemtir mongos (wanting, or overlooked, in my specimen), and 

 subsequently observed by Owen in other Lemuridae, is a lingual 

 character in Ccbiis, Macams, and Ateles. In Cebus hypolejiais 

 the process is flattened, and bifurcate at the tip. It measures 

 9 mm. in length, and is 6 mm. in width at point of attachment 

 to the freenum. Especial interest attaches to the frsenal 

 plate in Ateles, as it represents a hitherto undescribed bulb- 

 bearing area. 



GUSTATORY STRUCTURES. 



The Circumvallate Papillce. — The summits of the papillae 

 are rounded and the adjacent region papillate. They measure 

 1.50 mm. transversely and 0.90 mm. in height. Serous glands 

 are quite plentiful, occurring within the papillae as well as 

 beneath and around them. The ducts open at the deeper part 

 of the trenches. There appear to be about ten tiers of bulbs, 

 each tier containing on the average some ninety bulbs. They 

 measure 0.045 mm. in length and 0.025 mm. in breadth. 



The Lateral Gustatory Organs. — The organs are 5 mm. in 

 length, and the depth of the furrows is about i mm. The seven 

 folds are fairly regular and bear bulbs. Serous glands are 

 abundant, and their ducts open into the furrows at different 

 levels. The ducts of the intrapapillary glands occasionally open 

 into the furrows above the level of the bulbs. The bulbs, of 

 which there are from ten to fifteen tiers, are small and measure 

 0.044 mm. in length and 0.024 mm. in breadth. The fungiform 

 papilla bear bulbs, but not in great abundance. They are 

 placed as usual. 



The Tongue of Cercopithecus diana?- 



General Description. — The organ measures 55 mm. in length, 

 2 1 mm. in breadth, and is free from the f rasnum for 1 5 mm. 

 The under surface is impressed by a median groove extending 

 from the fraenum to the tip. Fungiform papillae of fair size are 

 thinly scattered over the dorsum. They are most abundant 

 about the tip, including its marginal portion. The circumvallate 



1 Lately studied by Luigi Tavernari, but with what results is not known to the 

 writer. 



