Plate XLIX 



Figs. 23-30. Frontal sections of the marginal cavity and alveolingual region 

 of an 11.5 millimeter embryo. Columbia Collection, No. 256. Slide 

 7, sections 12, 17, 22, 26, 27, 34, 42, 44. Thickness of sections, 13.3 /i, 

 X 115, reduced to |. 



2. .\ngulus oris. 



7. Orbital inclusion, pars lata. 



8. Orbital inclusion, pars cylindrica. 

 p. Orbital inclusion, lateral process. 



/J. Subparotid mesenchymal condensation 



2g. Lingual sulcus. 



JO. Submaxillary anlage. 



44. .\lveolingual region. 



45. Lingual nerve. 



4Q. Submaxillary ganglion. 



j6. Meckel's cartilage. 



64. Superior dental anlage. 



6y. Inferior dental anlage. 



6g. Buccomasseteric nerve. 



~o. Inferior dental nerve. 



7j. Masseter muscle. 



