644 



DR. C. F. SONNTAG ON THE COMPARATIVE ANATOMY 



my disposal did not permit histological examination being 

 made. 



The lingual glands are tubular or branching, and vary in 

 length. And authors who have described true vallate papillae 

 mention that glands open into the fosste. Murie writes as 

 follows of the tongue of Glohicephalus melas (25) : "It exhibits 

 numerous glandular papillse and depressions, probably the 

 representatives of papillae fungiformes; other larger and much 

 deeper furrows behind may be circumvallate cavities or mucous 

 glands." 



Text-figure 28. 



The tongue of Mesoplodon hiclens showing glandular orifices and 

 the five large sacs. 



Papillce : — In most Cetacea, papillas are scanty or absent, and 

 those which are present are usually tactile or mechanical in 

 function. The sense of taste is very slight or absent, and in no 

 other mammalian order is it so deficient. 



Papillae are most numerous in Orcella and Platanista. In the 

 former the oral part of the tongiie has filiform papillae, and the 

 pharyngeal part has pedunculated and sessile papillae, arranged 

 singly or in pairs at the mouths of large racemose glands. In 

 the latter the free part is thick with filiform papillae divided into 

 processes. 



