PLATE VIII. 



Figs. 15-17 (X 5). 

 Transections of the head of an embryo dog. 



Fig. 15. 



In the region of the vomeronasal organ. Note its relation to the vomero- 

 nasal cartilage. Maxillo-turbinals are shown. 



Fig. 1G. 



In the region of the maxillary sinus. Note the number of folds of the 

 ethmo-turbinals. 



Fig. 17. 



Near the cribriform plate. Note the increased number of folds of the 

 ethmo-turbinals and the maxillary sinus. 



Figs. 18-20 (X 5). 

 Transections of the head of an embryo cat. 



Fig. 18. 



In the region of the vomeronasal organ. Note its relation to the vomero- 

 nasal cartilage. The inferior turbinal is shown. 



Fig. 19. 



In the region of the maxillary sinus. Note the number of folds of the 

 ethmo-turbinals. 



Fig. 20. 



Near the cribriform plate. Note the increased number of folds of the 

 ethmo-turbinals. 



Figs. 21-23 (X 5). 

 Transections of the nose of a four months human fetus. 



Fig. 21. 



In the region of the vomeronasal organ. Note its relation to the septum 

 and to the vomeronasal cartilage. Inferior concha is shown. 



Fig. 22. 

 Shows the relation of the inferior and median conchfe. 



Fig. 23. 



Shows the relation of the superior, median and inferior conchae. Note the 

 olfactory bulb, the cribriform plate and a section of an olfactory bundle. 



