110 Trans. Acad. Sci. of St. Louis. 



8. Growth of cartilage takes place actively at certain 

 regions along the rod and spreads, a) into the membranous 

 cranial wall of the ethmoidal region and b)into the perirhinal 

 tissue. 



9. Thus there appear: a Processus uncinatus turning back 

 of the olfactory bulb and entering into the cranial side 

 wall; a Processus ethmoidalis, the first piece in the formation 

 of the anterior cranial wall, the later ethmoidal plate; a Pro- 

 •cessus nasalis medialis which builds the anterior cupola and 

 the medial wall of the nasal capsule in its anterior part ; a 

 Processus lateralis which gives rise, in part to the Lamina 

 ■cribrosa. 



10. The anterior trabecular plate was formed in connection 

 with the trabeculae ; it supports the olfactory bulbs, partici- 

 pates in the ventral boundary of the ethmoidal window, and 

 is secondarily connected with the bases of the rods (Col. 

 «th.) and their ethmoidal processes through the chondrifica- 

 tion in the ethmoidal window. 



11. A nasal septum begins by growth along the dorsal and 

 lateral regions of the cephalic surface of the ethmoidal plate, 

 •extending forward through the mesenchymal tissue of the 

 internasal space . 



12. The capsular wall about the olfactory foramen is at 

 first medial, but later caudal and medial of the nasal sac. 



13. The nasal capsule in the 40-45 mm. Amblystoma pos- 

 sesses a continuous roof. 



14. The Fenestra narina begins as a bay between the 

 Anterior cupola and the Lamina cribrosa. It includes the ex- 

 ternal naris and the end of the nasolacrimal duct. 



15. A bridge of cartilage and precartilage connects the 

 trabecular horn and Lamina cribrosa. It is crossed super- 

 ficially by the nasolacrimal duct. 



