752 Dr- J- BEAED, iMorphological Studies, 



section to show the enamel epithelium (ee), the outer epithelium 

 of the enamel organ (o e) and the stratified epithelium (s e) between 

 them. 



Plate XXXV. 

 The figures of this plate are reduced to two-thirds of there original size. 



Fig. 9. One tooth sac from fig. 3 (Petromyzon planeri) under high 



magnification. Zeiss F. oc. 2. Mag. 460. 

 Fig. 10. The horn groove of a Bdellostoma tooth , in longitudinal 



section. Zeiss F. oc. 2. Mag. 460. 

 Fig. 11. Section of a horny tooth oî Petroniyzon planeri, with reserve 



tooth. 

 Fig. 12. Diagram of the three-coned horny tooth of P. marinus. 

 Fig. 13. Section of a tooth of Myxine under low magnification. Zeiss 



C. oc. 2. Mag. 48. 



