o()S E. A. BAUMGAKTNEU 



down ward, one sc^iuliiig off n short caudal branch. Fi'oni the 

 origin of the caudal branch, the duct enlarges gradually up to 

 the end piece. 



The condition just described seems to be true of all of the 

 longer glands. That the end pieces are distinctly enlarged is 

 apparent in sections as well as in reconstructions (fig. 5). The 

 glands of the papilla occupying the foramen caecum are more 

 highly developed than those of the other papillae, as evidenced 

 by more branching and the greater length of the ducts. 



Nine vallate papillae are present in the tongue of a 15 cm. 

 fetus. Reconstructions were made of the two anterior papillae 

 on the right side. In one a very long gland extends deeply into 

 the tongue (fig. 6) . At its origin from the lower border of the 

 wall of the papilla two short glands are found. The long gland 

 extends downward about 0.5 cm. then divides into two branches. 

 Both of these subdivide, a subdivision of each branch going 

 lateralward. All carry enlarged knob-like masses at their ends. 

 These show beginning subdivision into several parts. About 

 0.15 mm. from its origin, several branches are given off from the 

 long gland. The latter show small rounded masses constricting 

 from the end bulb of each (fig. 6). 



Other glands of the same papilla are short and show occasional 

 anlagen of lateral branches on the stalks. Some small glands, 

 \\dthout terminal enlargements, are present on the lateral walls 

 of the papilla. 



A tongue from, a specimen slightly smaller than the previous 

 one (14.5 cm.) also has nine papillae. In this and other speci- 

 mens, some papiUae, when examined under low power lenses, 

 appear to consist of several small, closely crowded papillae en- 

 closed by one furrow. The condition described in the 10 cm. 

 fetus, viz., epithelial downgrowths subdi\iding the papilla into 

 smaller, closely associated ones, is foimd here. Four of the 

 nine papillae in a 14.5 cm. specimen were of this compound form, 

 and for the first time, a well-formed surrounding groove is pres- 

 ent. The papillae are somewhat raised above the level of the 

 dorsum of the tongue. A reconstruction of the right anterior 

 papilla shows fourteen glands in various stages of development. 



