PLATE 1 



EXPLANATION OF FIGURES 



2 Ventral view of a reconstruction of the right anterior j^apilla of an 8.5 

 cm. fetus showing gland anlagen from the lower border of the papilla. X 135. 



3 Same view of a reconstruction of the papilla from the foramen caecum of 

 a 10.0 cm. fetus. X 135. '*: ".^. \ 



4 Same view of a model of a papilla of the left side from an 11.5 cm. fetus, 

 showing enlarged end-pieces and constricted stalks. X 135. 



378 



