Plate XLIII 



Fig. 9. Camera lucida outline of the oral epithelium in frontal section of a 10 



millimeter embryo. Columbia Collection, No. 237, at the plane of the 



anguli oris, X 80, reduced to |. 

 Fig. 10. The same. Frontal section in the plane of the mandibular nerves, X So, 



reduced to 1. 

 Fig. II. Camera lucida outline of the oral epithelium in frontal section in the 



plane of the mandibular nerves, from the 10.5 millimeter embryo. 



Columbia Collection, No. 120, X 80, reduced to I. 



2. .^ngulus oris. 



6. Orbital inclusion. 



40. Lateral tongue swelling. 



41. Tuberculum impar. 

 60. Palate process. 



67. Mandibular nerve. 



6S, Maxillary nerve. 



7/. Trigeminal nerve. 



72. Gasserian ganglion. 



^6. Tubotympanic sulcus. 



8y. Hypophysis. 



