Fig. 11 Cross section through the ethmoid region a few sections in front of the 

 preceding figure, showing the separation of the capsular wall dorsally from the 

 septum, the thickening of the paries nasi to form a rudimentary concha, and the 

 fusion of the planum nasi and oartilago paraseptalis with the septum posterior to 

 the foramen praepalatinum which is seen in the following figure. X 15. 



Fig. 12 Cross section a short distance in front of the preceding figure, showing 

 the foramen praepalatinum (/.p.) and the commissura spheno-ethmoidalis {c.sph.). 

 X 15. 



Fig. 13 Cross section a short distance in front of the preceding figure showing 

 the crista longitudinalis septi (c.L), the pila supraglandularis (p.sg.), and the 

 lamina terminalis anterior {l.t.a.). X 15. 



Fig. 14 Cross section through the extreme anterior end of the olfactory capsule 

 of the same embryo, showing the glandula nasalis externa situated ventral to 

 the cavity of the capsule. X 15. 



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