PLATE 1 



DEVELOPMENT OF THE RECTUM 



FRANKLIN PARADISE JOHNSON 



^^S. 



s 



Fig. 7 



Fig. 8 



Fig. 9 



Fig. 10 



EXPLAN'ATIOX OF FIGURES 



7 to 10 Wax reconstructions of the opitheliiim of the pars analis recti. 



7 Human embryo of 22.8 mm. H. E.G., 871. X 3G. 6. rt. , bulbus analis; fl.fcL 

 anal ectoderm; a.m., position of anal membrane; !>.(., bulbus terminalis. 



8 Human embryo of 30 mm. H.E.C., 913. X 36. 



9 Human embryo of 29 mm. H.E.C., 914. X 3(3. 

 10 Human embryo of 37 nun. II. E.G., 820. X 36. 



50 



