JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE' II, 



Illustrating Mr. C. S. Tomes's Paper on the Development of 

 the Teeth, in an Armadillo. 



Tig. 

 1.— Section through the lower jaw of a foetal calf, 6 inches long. 



a. Meckel's cartilage. 



b. Dentine germ. 



c. Enamel organ. 



d. Process connecting the enamel germ with the deep layer of the 



oral epithelium. 



e. Epithelium heaped up over the situation of the developing tooth. 



f. Enamel germ of the successional permanent tooth. 



2. — From the lower jaw of a foetal armadillo {Tatusia Peba) 1^ inches 

 long. 



b. Dentine germ. 



c. Enamel germ. 



3 and 4. — Erom a foetal armadillo (T. Peba) 3 inches long. 



b. Dentine germ. 



c. Enamel germ. 



J. Germ of permanent tooth. 



g. Extremity of the cornua of the enamel germ. 

 h. Thin cap of formed dentine. 



